Overall Assessment:
The bibliometric data presents a collection of 941 documents published between 2003 and 2025 (inclusive) sourced from 351 different outlets indexed by SCOPUS. This suggests a moderately sized collection, representing a focused research area. The annual growth rate of 13.27% indicates a field experiencing considerable expansion and increasing research activity over this period. The average age of documents (6.29 years) suggests that the collection contains relatively recent publications, implying relevance to current research trends.
Scope and Coverage:
- Timespan (2003-2025): The coverage of over two decades provides a reasonable longitudinal view of the research area. This allows for the observation of trends, the identification of influential early works, and the tracking of how the field has evolved.
- Sources (351): The diversity of 351 sources implies that the research field draws upon a variety of journals, books, and other publication venues. This breadth suggests interdisciplinary influences or a field where relevant research is dispersed across numerous specialized outlets. Investigating *which* specific sources are most prominent would be a valuable next step. A limited amount of sources may reflect a very highly specific niche.
- Document Types: The dominance of *articles* (387) and *conference papers* (394) shows that the field relies heavily on both journal publications and conference proceedings for disseminating research. The presence of *book chapters* (85) suggests a degree of synthesis and consolidation of knowledge within edited volumes. The inclusion of *reviews* (38) indicates efforts to synthesize and critically evaluate existing literature, which is important for guiding future research.
Productivity:
- Documents (941): This is a fundamental indicator of the research output within the defined scope.
- Authors (2080): A substantial number of authors contributing to 941 documents indicates a collaborative research environment.
- Authors of single-authored docs (51): the number of single-authored document is low compared to the number of authors.
- Single-authored docs (53): The relatively small number of single-authored documents (53) compared to the total number of documents signals a preference for collaborative research within this field.
- Co-Authors per Doc (3.44): This metric reinforces the importance of collaboration, showing that, on average, each document has over three authors. This high number may highlight the complexity of the research or a trend towards larger research teams.
Impact and Influence:
- Average citations per doc (33.67): This is a key indicator of the impact of the research within the collection. An average of 33.67 citations per document suggests that the research has had a reasonable level of influence on subsequent work in the field. However, it is crucial to consider that citation counts vary significantly across disciplines and over time. This number should be compared to the average citation rates of other publications in similar fields and publication years for a more meaningful interpretation.
- References (36604): The large number of references indicates that the research builds upon a substantial body of prior knowledge. This is typical of most scientific fields.
- Keywords Plus (ID) and Author’s Keywords (DE): The presence of both Keywords Plus (automatically generated by the database) and Author’s Keywords reflects efforts to index and categorize the research. Analyzing the frequency and co-occurrence of these keywords can reveal the key themes, emerging trends, and intellectual structure of the research field.
Collaboration:
- International co-authorships % (23.49): The fact that almost a quarter of the studies are conducted by international teams indicates that the research area is highly networked, with potential benefits stemming from diverse perspectives and resource sharing.
Further Investigations and Considerations:
- Specific Source Analysis: Identify the journals and other sources that contribute the most documents to the collection. This will reveal the core publication outlets in the field.
- Citation Analysis: Investigate the distribution of citations. Are there a few highly cited papers driving the average, or is there a more even distribution of impact?
- Keyword Analysis: Conduct a more in-depth analysis of the keywords to identify the major research themes and trends.
- Author Network Analysis: Visualize the collaboration network of authors to identify influential researchers and research groups.
- Comparison with Other Fields: Benchmark the citation rates and other metrics against comparable fields to assess the relative impact and productivity of the research area.
- Database Bias: Remember that SCOPUS has its own coverage biases. Results might differ slightly if the collection were built from Web of Science or another database.
In summary: This collection represents a growing and collaborative research area with a moderate level of impact, based on citation metrics. Further analysis of the specific sources, keywords, and citation patterns would provide a more nuanced understanding of the field’s dynamics and intellectual structure. The presence of international collaborations is a positive sign for the research’s breadth and potential impact.

Annual Scientific Production

Average Citations Per Year

Three-Field Plot
Overall Structure and Purpose
The three-field plot (also known as a Sankey diagram in this context) visualizes connections between three sets of variables:
- Left Field (CR): Cited References. These are the publications that the authors in the central field cite in their own work.
- Center Field (AU): Authors. This is the main focus of the analysis, showing a list of authors extracted from the SCOPUS dataset.
- Right Field (KW_Merged): Keywords. These are the keywords associated with the publications in the dataset. The “\_Merged” suffix suggests these keywords might be a combination of author-supplied keywords and/or keywords assigned by the SCOPUS database.
The plot shows how authors in the central field are connected to the references they cite (left) and the keywords associated with their publications (right). The thickness of the connecting lines represents the strength or frequency of the relationship. A thicker line indicates a stronger association.
Interpreting the Connections
1. Author – Cited Reference Links (AU-CR):
* This connection reveals the intellectual foundations of each author’s work. By examining which references are frequently cited by a particular author, we can understand the theoretical or empirical basis of their research.
* For example, we can see that Parida V. strongly cites Reim W., Parida V., and Ortqvist D., indicating that they are building upon or directly engaging with this previous work on product-service systems. The same observation can be made about other authors as well.
2. Author – Keyword Links (AU-KW_Merged):
* This link highlights the topical focus of each author’s research. It shows which keywords are most frequently associated with an author’s publications.
* For example, we can see that Parida V. work is strongly linked to the keyword “product-service systems”.
3. CR-KW_Merged Links:
* The plot also implicitly shows the relationships between cited references and keywords, even though there are no direct links. This can be indirectly observed by linking the source and destination nodes with the same origin node.
* For instance, a paper by Reim, Parida and Ortqvist (“reim w. parida v. ortqvist d. product-service systems (pss)”) is associated with the keyword “product-service systems”.
Specific Observations & Potential Insights
- Product-Service Systems Focus: The prominence of “product-service systems” as a keyword and the frequency with which papers on this topic are cited suggest this is a dominant theme within the dataset. Several authors are heavily connected to this keyword.
- Business Model Research: The presence of “business models” and citations to “osterwalder a. pigneur y. business model generation” suggests a significant line of research related to business models.
- Sustainability Connection: Several authors and cited references connect to the keyword “sustainability,” suggesting that research on product-service systems and related topics is often linked to sustainability considerations.
- Servitization: “Servitization” is another prominent keyword, indicating research is also focused on this area.
Critical Discussion Points for Researchers
- Database Bias: Remember that this analysis is based on SCOPUS data. SCOPUS has its own coverage characteristics. Consider whether SCOPUS adequately represents the field you are studying.
- Keyword Limitations: Merged keywords can sometimes be too broad or too specific, potentially obscuring finer-grained relationships. Think critically about whether the keyword aggregation is meaningful.
- Citation Network Effects: Highly cited papers tend to get cited even more, which can amplify their apparent importance.
- Missing Authors/References/Keywords: The plot shows only the *most frequent* connections. There may be other relevant authors, references, or keywords that are not displayed. Consider the threshold used to filter the data.
- Temporal Dynamics: The plot provides a static snapshot. It doesn’t show how these relationships have evolved over time.
Guidance for Data-Driven Interpretation
1. Focus on Strong Links: Begin by analyzing the most prominent connections (thickest lines). These are the most robust and reliable patterns.
2. Explore Specific Authors: Select a specific author from the central field and trace their connections to cited references and keywords. This allows you to build a profile of their research.
3. Consider Multiple Perspectives: Cross-validate your interpretations by comparing different authors, references, and keywords. Look for converging evidence to support your conclusions.
4. Contextualize with Domain Knowledge: Supplement the bibliometric data with your own knowledge of the field. Do the relationships revealed by the plot make sense in the context of the existing literature?
5. Iterative Refinement: Bibliometric analysis is an iterative process. Use the insights gained from the plot to refine your research questions and conduct further analyses.

Most Relevant Sources

Core Sources by Bradford’s Law

Sources’ Local Impact

Sources’ Production over Time

Most Relevant Authors

Authors’ Production over Time
Overall Trends and Observations:
- Recent Focus on Digitalization and Circular Economy/Product-Service Systems: The plot, combined with the highly cited articles, clearly points to a surge in research related to the intersection of digitalization, circular economy (CE), and Product-Service Systems (PSS) in recent years. This suggests this is a hot topic and area of active investigation.
- Impactful Authors: Certain authors show high citation counts, implying significant contributions and influence within the field. These authors serve as key figures in shaping the research landscape.
- Shift in Research Focus: Many authors appear to have expanded their research interests over time to incorporate digitalization and CE aspects into the realm of PSS.
Individual Author Analysis:
- PARIDA V: Shows relatively consistent activity across the timeline. The publication in 2019 and 2020 have notably high citation impact (Digital Servitization Business Models in Ecosystems: A Theory of the Firm, JOURNAL OF BUSINESS RESEARCH, 2019, TCpY 99;THE RELATIONSHIP BETWEEN DIGITALIZATION AND SERVITIZATION: THE ROLE OF SERVITIZATION IN CAPTURING THE FINANCIAL POTENTIAL OF DIGITALIZATION, TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE, 2020, TCpY 87.5). His more recent publication (LINKING CIRCULAR ECONOMY AND DIGITALISATION TECHNOLOGIES: A SYSTEMATIC LITERATURE REVIEW OF PAST ACHIEVEMENTS AND FUTURE PROMISES, TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE, 2022, TCpY 112) has the highest TCpY overall in the dataset, indicating a strong recent influence, likely a review paper solidifying this author influence in the field.
- KOHTAMÄKI M: Shows a pattern similar to Parida V, with consistent activity and high citation impact in similar years (DIGITAL SERVITIZATION BUSINESS MODELS IN ECOSYSTEMS: A THEORY OF THE FIRM, JOURNAL OF BUSINESS RESEARCH, 2019, TCpY 99; THE RELATIONSHIP BETWEEN DIGITALIZATION AND SERVITIZATION: THE ROLE OF SERVITIZATION IN CAPTURING THE FINANCIAL POTENTIAL OF DIGITALIZATION, TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE, 2020, TCpY 87.5), particularly in the late 2010s and early 2020s. The research focus closely aligns with Parida V.
- PEZZOTTA G: A later start compared to the others, with increased activity in recent years. The citation counts also show a growing influence (DIGITAL TECHNOLOGIES IN PRODUCT-SERVICE SYSTEMS: A LITERATURE REVIEW AND A RESEARCH AGENDA, COMPUTERS IN INDUSTRY, 2020, TCpY 33).
- ROZENFELD H: Has a more dispersed activity pattern. Their older publications have notable TCpY (EMPLOYING THE BUSINESS MODEL CONCEPT TO SUPPORT THE ADOPTION OF PRODUCT-SERVICE SYSTEMS (PSS), INDUSTRIAL MARKETING MANAGEMENT, 2013, TCpY 17.8).
- CAUCHICK-MIGUEL PA: The publications also have notable TCpY (EXPLORING THE CHALLENGES FOR CIRCULAR BUSINESS IMPLEMENTATION IN MANUFACTURING COMPANIES: AN EMPIRICAL INVESTIGATION OF A PAY-PER-USE SERVICE PROVIDER, RESOURCES, CONSERVATION AND RECYCLING, 2018, TCpY 18.9).
- KIM YS: Publication output appears more sparse.
- MCALOONE TC & PIGOSSO DCA: Show co-authored articles, judging from the identical titles and TCpY (THE EMERGENT ROLE OF DIGITAL TECHNOLOGIES IN THE CIRCULAR ECONOMY: A REVIEW, PROCEDIA CIRP, 2017, TCpY 44.1; TOWARDS PRODUCT-SERVICE SYSTEM ORIENTED TO CIRCULAR ECONOMY: A SYSTEMATIC REVIEW OF VALUE PROPOSITION DESIGN APPROACHES, JOURNAL OF CLEANER PRODUCTION, 2020, TCpY 31.8; CONFIGURING NEW BUSINESS MODELS FOR CIRCULAR ECONOMY THROUGH PRODUCT-SERVICE SYSTEMS, SUSTAINABILITY (SWITZERLAND), 2019, TCpY 15.4). Their joint work seems to be influential.
- SACCANI N & ADRODEGARI F: Similar to McAloone and Pigosso, their publications and TCpY (EXPLORING HOW USAGE-FOCUSED BUSINESS MODELS ENABLE CIRCULAR ECONOMY THROUGH DIGITAL TECHNOLOGIES, SUSTAINABILITY (SWITZERLAND), 2018, TCpY 60.4; THE ROLE OF DIGITAL TECHNOLOGIES TO OVERCOME CIRCULAR ECONOMY CHALLENGES IN PSS BUSINESS MODELS: AN EXPLORATORY CASE STUDY, PROCEDIA CIRP, 2018, TCpY 19.2; BUSINESS MODELS FOR THE SERVICE TRANSFORMATION OF INDUSTRIAL FIRMS, SERVICE INDUSTRIES JOURNAL, 2017, TCpY 11.8) are very similar. This suggests a co-authorship pattern.
Implications for Researchers:
- Identify Key Literature: The list of highly cited articles provides a solid starting point for researchers to delve deeper into the concepts of digital servitization, circular economy integration in PSS, and the role of digital technologies.
- Explore Research Gaps: Analyze the publications to identify potential research gaps. For example, are there specific industries or PSS models that are under-explored in the context of digital circular economy?
- Follow Influential Authors: Keep track of the publications by Parida V, Kohtamäki M, McAloone TC, Pigosso DCA, Saccani N, and Adrodegari F as they are clearly shaping the direction of the field.
- Consider Interdisciplinary Approaches: Given the focus on technology, business models, and sustainability, interdisciplinary research is likely to be crucial for advancing the field.
Further Considerations:
- Database Coverage: The analysis is limited to SCOPUS. Including data from other databases (Web of Science, etc.) might provide a more comprehensive view.
- Citation Lag: Newer publications may not yet have accumulated a significant number of citations, even if they are potentially impactful. Consider the publication year when assessing influence.
- Contextual Analysis: A deeper analysis of the article abstracts and full texts would be necessary to fully understand the specific contributions of each author and the nuances of their research.
In summary, this plot provides a valuable overview of the key players and trends in the research area of digital servitization and circular economy in product-service systems. It highlights influential authors, seminal publications, and the increasing importance of digitalization in achieving circularity within PSS business models.

Authors’ Local Impact

Most Relevant Affiliations

Affiliations’ Production over Time

Corresponding Author’s Countries
Overall Productivity:
- Germany is the most productive country in this dataset by a significant margin, with 130 articles.
- Sweden, China, and Italy follow, with a substantial number of publications.
- The remaining countries have progressively fewer publications, indicating varying levels of research activity within this specific dataset.
International Collaboration (MCP):
- Finland has the highest MCP ratio at 57.7%, indicating a strong focus on international collaboration. This suggests that a significant portion of research led by corresponding authors in Finland involves collaboration with researchers from other countries.
- Netherlands (40.9%), Belgium (41.7%), and Indonesia (44.4%) also demonstrate high MCP ratios, highlighting their commitment to international research partnerships.
- China (36.7%), Brazil (32%), and Portugal (30.8%) show a moderate level of international collaboration, with MCP ratios above 30%.
- Sweden (29.1%), the United Kingdom (28.3%), and Spain (27.3%) show similar international collaboration.
Single Country Publications (SCP):
- Germany and Italy have a large proportion of SCP publications, suggesting a strong domestic research base. Although Germany has a substantial number of total publications, its MCP ratio is relatively low (9.2%) compared to other countries, indicating a greater focus on domestic research.
- Japan and Korea have a very low MCP rate; this could reflect cultural and societal preference for domestic collaboration.
Balance Between Domestic and Global Research Engagement:
- Countries like Germany, Italy, Japan, and Korea appear to prioritize domestic research, with a larger proportion of SCP publications.
- In contrast, countries like Finland, Netherlands, Belgium, China, and Indonesia exhibit a greater emphasis on international collaboration, reflected in their higher MCP ratios.
- The remaining countries show a mixed approach, with a balance between domestic and international research engagement.
Potential Interpretations and Discussion Points:
- Research Funding and Policies: The observed patterns could be influenced by national research funding policies, which may either encourage or discourage international collaboration.
- Research Focus and Expertise: The specific research fields and areas of expertise within each country might also play a role. Some research areas may naturally lend themselves to international collaboration, while others are more domestically focused.
- Geopolitical Factors: Geopolitical relationships and historical ties between countries could influence the extent of international collaboration.
- Data Limitations: It’s essential to consider that this analysis is based on data from SCOPUS. The patterns observed may not be representative of all research output from these countries.
- Corresponding Author Bias: The analysis focuses on the country of the *corresponding* author, which may not fully capture the extent of international collaboration if co-authors from other countries are involved but not designated as the corresponding author.
Further Analysis:
- It would be valuable to investigate the specific research areas in which these countries are publishing, as this could provide insights into their collaboration patterns.
- Comparing these results with data from other bibliographic databases (e.g., Web of Science) could help validate the findings and provide a more comprehensive picture.
- Analyzing the specific countries with which each nation collaborates could reveal interesting patterns of research partnerships.
By considering these interpretations and discussion points, researchers can gain a deeper understanding of the dynamics of international collaboration within their field and use this knowledge to inform their own research strategies and funding proposals.

Countries’ Scientific Production

| GERMANY | 713 |
| ITALY | 295 |
| SWEDEN | 282 |
| UK | 229 |
| CHINA | 228 |
| BRAZIL | 216 |
| FRANCE | 147 |
| NETHERLANDS | 100 |
| FINLAND | 96 |
| JAPAN | 96 |
| SOUTH KOREA | 67 |
| DENMARK | 54 |
| AUSTRALIA | 52 |
| USA | 50 |
| SPAIN | 49 |
| GREECE | 45 |
| INDIA | 45 |
| PORTUGAL | 43 |
| BELGIUM | 37 |
| SWITZERLAND | 33 |
| NORWAY | 32 |
| AUSTRIA | 30 |
| INDONESIA | 29 |
| POLAND | 26 |
| MALAYSIA | 18 |
| MEXICO | 16 |
Countries’ Production over Time

Most Cited Countries

Most Global Cited Documents

Most Local Cited Documents
Overall Observations
- Journal Prominence: The *Journal of Cleaner Production (J Clean Prod)* and *Business Strategy and the Environment (BUS STRATEGY ENVIRON)* appear frequently, suggesting these journals are central to the research field defined by your dataset. *CIRP Annals – Manufacturing Technology (CIRP ANN MANUF TECHNOL)* is also relatively important. *Production Planning & Control* and *Journal of Manufacturing Technology Management* appear a couple of times, suggesting some relevance.
- Recent Focus: A significant portion of the highly cited articles are from 2010 onwards, especially in the 2014-2019 range. This points toward a potentially evolving research area, with more recent publications making a strong impact within the community represented by your dataset.
- Normalization Matters: The NLC and NGC values are crucial. A high citation count alone doesn’t tell the whole story. We need to consider how the citation count compares to the average for papers published in the same year.
Key Articles and Their Implications
Let’s highlight some notable articles based on the data provided:
- TUKKER A, 2004, BUS STRATEGY ENVIRON: LC 362, GC 1922, NLC 1, NGC 1 – This article stands out due to its very high local citation count (LC = 362). It seems to be a seminal work within the specific research domain. Even though NLC and NGC values are 1, that doesn’t undermine the fact that it is the most locally cited article, so it is probably a foundational article that the other articles often cite.
- REIM W, 2015, J CLEAN PROD: LC 129, GC 647, NLC 23.45, NGC 14.46 – This article has both a strong local and global normalized citation impact. This indicates it’s not just important within your specific dataset, but also has significant influence on the broader research landscape, suggesting a substantial contribution to the field.
- MEIER H, 2010, CIRP ANN MANUF TECHNOL: LC 129, GC 814, NLC 11.4, NGC 11.66 – This article mirrors the above in that its also has strong local and global normalized citation impact. This shows that the article has a significant influence on the broader research landscape, suggesting a substantial contribution to the field.
- ANNARELLI A, 2016, J CLEAN PROD: LC 69, GC 297, NLC 14.93, NGC 9.61 – With normalized citations considerably above 1, this article is a key publication in the more recent literature.
- BARQUET APB, 2013, IND MARK MANAGE: LC 64, GC 232, NLC 21.77, NGC 6.69 – High NLC value indicates this article punches above its weight in terms of local citations relative to what’s typical for its publication year.
- MONT O, 2006, J CLEAN PROD: LC 49, GC 228, NLC 3, NGC 2.89 – Although having a smaller LC than others, its NLC shows local relevance.
- EVANS S, 2017, BUS STRATEGY ENVIRON: LC 25, GC 930, NLC 5.18, NGC 13.18 – Relatively high global citation count coupled with good NGC suggests substantial broader impact beyond the local dataset, and the article seems relatively more important in the global context.
Interpretation Guide & Further Questions
Based on this analysis, here are some questions and interpretations to consider:
1. Research Focus Confirmation: Do the journals and article topics align with the intended scope of your research? If not, it might indicate that your dataset includes some tangential areas.
2. Key Themes: What are the common themes or keywords in these highly cited articles? This can help you identify the core topics and research trends within your dataset. Are there particular methodologies, theoretical frameworks, or application areas that are prominent?
3. Evolution of the Field: By examining the publication years, can you trace the evolution of research in this area? Are there shifts in focus, emerging trends, or landmark publications that have shaped the field?
4. Impact Assessment: Are there articles with high global impact but relatively low local citations? This could indicate research that is broadly influential but less directly relevant to the specific focus of your dataset. Conversely, high local citations with lower global impact might represent work that is highly specialized or relevant to a niche area.
5. Tukker (2004) Significance: Given its very high local citation count, it is worth reading this article to understand the relevance to your dataset.
Next Steps with Biblioshiny
- Keyword Analysis: Use Biblioshiny’s keyword co-occurrence network analysis to visualize the relationships between keywords in your dataset. This can help you identify the key themes and research areas.
- Co-Citation Analysis: Analyze which articles are frequently cited together. This can reveal intellectual communities and clusters of research within your dataset.
- Thematic Evolution: Explore how the research themes have changed over time by conducting a thematic evolution analysis.
By combining these quantitative bibliometric indicators with a qualitative reading of the key articles, you can gain a deeper understanding of the research landscape and critically assess the significance of your findings. Remember to tailor your interpretation to the specific context and research questions of your study.

Most Local Cited References

Reference Spectroscopy
Understanding the Plot
- Black Line: Represents the overall citation frequency of publications from a given year within the SCOPUS dataset analyzed. Higher peaks indicate years with a greater number of cited publications.
- Red Line: Shows the *deviation* from the 5-year *median* citation frequency (using a *non-centered* window, meaning it looks backward). Crucially, this identifies *peak years of historical significance* within the field. A high red line signifies that publications from that year are being cited at a significantly higher rate than the median of the preceding five years.
Overall Interpretation
The RPYS plot indicates a relatively recent emergence and rapid growth of the research area. There is a general trend: very little activity before about 1980, then a slow start that gains in momentum around the year 2000, and a high peak after 2010. This suggests that the topic gained considerable traction, expanded rapidly, and then has been subject to decreasing interest from researchers.
Interpretation of Key Years
Let’s look at the peak years highlighted by the red line and the most cited publications from those years:
- 1988: Servitization Emerges: The earliest peak centers around the work of Vandermerwe and Rada on “Servitization of Business.” This strongly suggests that 1988 marks a key point in the conceptualization and early exploration of servitization as a business strategy. The repeated listing of the same article suggests that this single article is particularly salient in this peak.
- 1994: Solidifying Qualitative Research Methods: The peak in 1994 emphasizes the importance of methodologies and suggests a field in need of validation. The identified works (Miles & Huberman, Yin, Fontana & Frey) are foundational texts in qualitative data analysis and case study research. This implies that qualitative research methods became more prominent in the field around this time.
- 1999: Profit Imperative and Early PSS Considerations: In 1999 the peak indicates the consideration of profit from the perspective of companies. The emergence of “Product-Service Systems” (PSS) as an area of interest is evident here. Wise et al.’s focus on “Servicizing” and extended product responsibility further reinforces this shift.
- 2002: Defining PSS: The focus remains firmly on the concept of Product-Service Systems (PSS), specifically on the Journal of Cleaner Production. Mont’s work on clarifying the PSS concept is highlighted. This indicates a period of conceptual refinement and establishing a solid theoretical basis for PSS research.
- 2004: Exploring PSS Types and Sustainability: Tukker’s work on different types of PSS and their relationship to sustainability emerges as a key contribution. The prominence of “Business Strategy and the Environment” as a journal suggests an increasing focus on the environmental aspects of PSS. Mont’s question about PSS being a “panacea or myth” suggests an emerging critical perspective.
- 2006: PSS as a Maturing Research Field: The peak around 2006 is heavily influenced by the article from “Journal of Cleaner Production” assessing a decade of PSS research (Tukker & Tischner). Aurich’s work on life cycle-oriented design further underscores the growing sophistication and practical application of PSS principles.
- 2010: Business Models: Business models emerge as a significant theme. Osterwalder & Pigneur’s “Business Model Generation” becomes highly influential, along with Teece’s work on business models, strategy, and innovation. This suggests a broadening of the research scope.
- 2013: Literature Reviews on PSS and Sustainable Innovation: The peak centers around literature reviews, specifically from Beuren et al. on PSS and Boons & Lüdeke-Freund on business models for sustainable innovation. This signals a period of consolidation and critical assessment of the existing body of knowledge.
- 2015: PSS and the Circular Economy: Tukker’s review article linking PSS to a resource-efficient and circular economy gains prominence. This indicates a shift towards a more systemic and resource-oriented perspective.
- 2017: Circular Economy and Business Model Innovation: The peak in 2017 is characterized by conceptual work on the circular economy. Research focuses on definitions (Kirchherr et al.), customization (Song & Sakao), service transformation (Adrodegari & Saccani), and new taxonomies of circular economy business models (Urbinati et al.).
Key Takeaways and Discussion Points
- Evolution of the Field: The RPYS plot reveals a clear evolution of the field, starting with the emergence of “servitization” and then shifting to the development and refinement of the Product-Service System (PSS) concept. More recently, there’s a strong connection to the circular economy and business model innovation.
- Methodological Influences: The prominence of qualitative research methods in the mid-1990s highlights the importance of in-depth case studies and understanding complex organizational phenomena in this area.
- Sustainability Focus: The increasing emphasis on sustainability, resource efficiency, and the circular economy demonstrates a growing awareness of the environmental implications of product and service design.
- Journal Influence: The “Journal of Cleaner Production” consistently appears as a key publication outlet, indicating its role in shaping the discourse and disseminating research findings in this field.
- Potential Research Gaps: While the plot doesn’t explicitly show gaps, the analysis can inform further research. For example, it would be interesting to investigate the reasons for the decreasing interest observed after 2010. Are there specific areas within the broader field that are still underdeveloped? Are there practical challenges hindering the widespread adoption of PSS and circular economy principles?
Limitations
- SCOPUS Database: The analysis is limited to publications indexed in SCOPUS. Results might differ if other databases were used (e.g., Web of Science).
- Citation Bias: Citation counts can be influenced by factors other than the inherent quality or impact of a publication (e.g., self-citations, citation cartels).
- Single Field: The analysis covers the research articles indexed in the Scopus database that address the field of study specified by the user.
In conclusion, the RPYS plot provides valuable insights into the historical development, key concepts, and emerging trends in the field. By examining the most cited publications from peak years, we can gain a deeper understanding of the intellectual foundations and evolving priorities of this area of research.

Most Frequent Words

WordCloud

TreeMap

Words’ Frequency over Time

Trend Topics
Overall Interpretation:
The plot visualizes the evolution of research topics over time, extracted from the Scopus database using keyword analysis. The x-axis represents time (years), and the y-axis lists the keywords (KW_Merged). The size of the bubbles indicates the relative frequency of each keyword in a given year. The light blue lines represent the interquartile range (IQR), showing the spread of the frequency distribution for each term annually, while the central point marks the median frequency. This allows us to see not just the average frequency, but also how much the frequency varies from year to year.
Key Observations and Potential Discussion Points:
1. Temporal Trends: The plot clearly shows how certain topics have gained or lost prominence over time. Keywords appearing higher up on the chart generally reflect more recent trends, while those lower down have earlier peaks or have faded.
2. Emerging Topics (Recent Years): A cluster of new keywords dominates the later years (2019-2023):
* “Service business models,” “data analytics”, “circular business model”, “digital servitization”, and “smart product-service system” show a significant surge in recent years (around 2021-2023). This suggests an increasing focus on service-oriented business models, digital transformation of service and production, and leveraging data. The appearance of “circular business model” and “circular economy” might imply a growing interest in sustainability and resource efficiency in business research.
3. Maturing Topics (Mid-Range): The topics between the range of 2015-2021 exhibit a period of increased frequency and seem to have reached a relatively stable interest.
* “Industry 4.0” gained prominence around 2019-2021, indicating the impact of the fourth industrial revolution on research trends.
* “Sustainability,” “product-service systems,” “product service system,” “decision making,” and “product design” also show significant activity in this period, suggesting sustained interest in sustainable practices, integrated product-service offerings, and design-related research.
4. Declining/Stable Topics (Earlier Years):
* Topics like “industrial product,” “service,” “value chains”, “automation”, “industrial product-service systems” and “research” were relatively more prominent in earlier years (2009-2015) and might represent foundational research areas. Their relatively stable presence suggests these are still relevant, but not necessarily growing as rapidly as newer topics.
* “Machine Tools”, “Integrated products” peak around 2015, before losing relevance.
Possible Discussion Points for Researchers:
- Connecting the Trends: How do the emerging topics relate to the maturing and declining topics? For example, is the rise of “digital servitization” building upon the foundations laid by earlier work on “service” and “automation”?
- Underlying Drivers: What are the external factors driving these trends? Consider technological advancements, policy changes, economic shifts, and societal needs.
- Research Gaps: Are there any gaps in the research landscape? Are certain areas under-explored, or are there opportunities to integrate different concepts?
- Future Directions: Based on these trends, what are the potential future directions for research in this field? What new keywords or concepts might emerge in the coming years?
- Database Bias: Acknowledge that the analysis is based on the Scopus database. How might the trends differ if a different database (e.g., Web of Science, Google Scholar) were used? Each database has its own coverage and biases.
- Keyword Limitations: Discuss the limitations of using KW\_Merged. Are there issues with keyword consistency, ambiguity, or the potential for important concepts to be missed? Would other text fields (e.g., titles, abstracts) provide different insights?
- Regional/Discipline Differences: Does this trend analysis reflect global trends, or are there regional or disciplinary variations that are not captured here?
In summary, this trend topics plot provides a valuable overview of the evolution of research interests in the field. By carefully analyzing the emergence, maturation, and decline of different keywords, researchers can gain insights into the key drivers, current state, and future directions of their area of study.

Clustering by Coupling


Co-occurrence Network
Overall Structure:
- The network is visualized as a graph where nodes represent keywords and edges represent the co-occurrence of those keywords within the Scopus documents analyzed.
- The size of the nodes likely corresponds to the frequency of the keyword’s occurrence, with larger nodes indicating more frequent terms. “Product-service systems” is, visually, the most frequent term.
- The edges connecting the nodes indicate the strength of the association between the keywords. Thicker edges suggest a stronger co-occurrence relationship.
- The graph contains multiple nodes, some of which have numerous links indicating a strong co-occurrence.
Community Detection (Topics):
- The “walktrap” clustering algorithm was used. This algorithm identifies communities based on random walks within the network. The resulting clusters (shown in different colors – blue and red) represent distinct but related research topics or themes.
- Based on the two distinct clusters, we can identify two dominant themes. The first one (red) has a strong focus on Product-Service Systems (PSS) and Business Models. Keywords like “Product-Service Systems,” “Business Models,” “Product Design,” “Manufacture,” and “Sustainable Development” are strongly associated. This community explores the design, development, and implementation of PSS, including business model innovation and sustainable practices.
- The second cluster (blue) seems to be focused on Sustainability and Circular Economy. Keywords like “Circular Economy,” “Circular Business Models,” “Sustainability,” “Innovation,” and “Environmental Impact” form this group. This suggests a focus on sustainable business practices, resource efficiency, and the broader environmental implications of business activities.
- The interconnection of the clusters is interesting. There are terms such as “Environmental Impact” and “Sustainability” that are associated with “Product-service systems”. This indicates there are relationships between the two clusters and therefore are potentially linked, which means that the research on PSS and business models incorporates sustainability.
Most Connected Terms (Key Insights):
- The analysis parameters specified to label the 50 most connected terms (‘label.n = 50’).
- “Product-Service Systems” is clearly the most connected term in the entire network. This indicates that the entire research area is heavily centered around this concept. Given its central position, this suggests this is the main topic of the corpus.
- Other highly connected terms in the red cluster include: “Business Models,” “Product Design,” “Manufacture,” and “Sustainable Development.” These represent the core components associated with PSS research.
- Within the blue cluster, “Circular Economy,” “Sustainability,” and “Innovation” appear as key terms, highlighting the research focus on sustainable business practices and their role in innovation.
Interpretation and Discussion Points for Researchers:
- Dominant Research Themes: The network analysis reveals two major research themes related to PSS and Circular Economy. This can provide a useful high-level overview of the research landscape.
- Interdisciplinary Nature: The connections between “Sustainability” and “PSS” indicate an interdisciplinary nature of research, drawing from both engineering/design and environmental/sustainability perspectives.
- Future Research Directions: The network helps to identify potential gaps or areas for future research. For example, are there specific aspects of the relationship between circular economy and product-service systems that are under-explored?
- Keyword Selection: The analysis can inform keyword selection for future research or literature searches. The most connected terms are clearly essential keywords for searching within this research domain.
- Comparison to Other Datasets: It would be insightful to compare this network to networks generated from other databases (e.g., Web of Science) or using different timeframes. This could reveal trends in research focus.
- Limitations: The interpretation is based on the assumption that keyword co-occurrence reflects thematic relationships. It’s important to acknowledge that the analysis does not capture the nuances of individual research papers.
- Parameter Sensitivity: It is important to remember that the network structure is influenced by the parameters used for generation, such as the normalization method, clustering algorithm, and the minimum edge threshold (“edges.min=2”). Different parameters might yield slightly different results, warranting a sensitivity analysis to ensure the robustness of the findings.
In conclusion, this word co-occurrence network provides a valuable overview of the research landscape related to product-service systems. It highlights dominant research themes, key concepts, and potential areas for future exploration. Remember to consider the limitations of the analysis and the sensitivity to parameter choices when drawing conclusions. Remember that the interpretation heavily relies on the parameters used to generate the graph. Analyzing the influence of these parameters will make your analysis stronger.


Thematic Map
Overall Structure and Interpretation
The strategic map visualizes the intellectual structure of the research field based on the keywords extracted from the SCOPUS database. It plots keyword clusters based on two key metrics:
- Centrality (Relevance Degree): This represents the importance of the theme within the overall research field. Higher centrality indicates that the theme is strongly connected to other themes and represents a core area of investigation.
- Density (Development Degree): This reflects the development or maturity of the theme. Higher density suggests a well-established and actively researched area.
The map is divided into four quadrants, each representing a different type of theme:
- Motor Themes (Upper Right): High centrality and high density. These are well-developed and important themes, driving research in the field. There are no motor themes in this graph.
- Basic Themes (Lower Right): High centrality and low density. These are fundamental but perhaps less actively researched themes. They form the foundation upon which other research builds.
- Niche Themes (Upper Left): Low centrality and high density. These are specialized areas with strong internal connections but weaker links to the broader field.
- Emerging or Declining Themes (Lower Left): Low centrality and low density. These themes may be new, fading in importance, or relatively isolated within the field. There are no emerging or declining themes in this graph.
Cluster Descriptions and Article Analysis
Based on the provided data, here’s a detailed look at each cluster:
1. Manufacture (Motor Theme):
* Location: Center of the graph.
* Interpretation: This cluster sits squarely in the middle, indicating relatively high centrality and relatively high density. This means it’s a well-established and important area of research within the dataset.
* Keywords: “manufacture,” “competition,” “manufacturing companies.”
* Central Articles:
* MARQUES P, 2013, PROCEDIA CIRP (Pagerank: 0.235): Likely focuses on manufacturing processes, systems, or technologies.
* MOURTZIS D, 2022, PROCEDIA CIRP (Pagerank: 0.226): Likely a more recent publication focusing on cutting-edge issues or new advancements within manufacturing.
* CHEN Y-T, 2014, ADV TRANSDISCIPL ENG (Pagerank: 0.225): May represent a more interdisciplinary perspective on manufacturing.
* Inferences: The cluster seems to represent the core concepts of manufacturing, potentially related to competition and the activities of manufacturing companies. The journal *Procedia CIRP* appears prominently, suggesting a focus on conference proceedings within the field of manufacturing engineering.
2. Product-Service Systems (Basic Theme):
* Location: Lower Right quadrant.
* Interpretation: Positioned as a “Basic Theme,” indicating high centrality (important to the field) but lower density (perhaps less actively researched *compared* to “Manufacture”, but still important).
* Keywords: “product-service systems,” “business models,” “product-service system.”
* Central Articles:
* BARQUET AP, 2016, PROCEDIA CIRP (Pagerank: 0.233): Likely a case study or a specific application of PSS.
* SCHEEPENS AE, 2016, J CLEAN PROD (Pagerank: 0.227): Probably related to the environmental or sustainability aspects of PSS. The journal suggests a focus on cleaner production methods.
* MOURTZIS D, 2016, PROCEDIA CIRP (Pagerank: 0.226): May explore the design, implementation, or management of PSS.
* Inferences: This cluster focuses on the concept of integrating products and services, often with a focus on new business models. The presence of *J Clean Prod* indicates a connection to sustainability and environmentally conscious practices.
3. Sustainability (Niche Theme):
* Location: Upper Left quadrant.
* Interpretation: Classified as a “Niche Theme,” implying high density (well-developed internally) but low centrality (less connected to other core themes in the *overall* field as defined by these keywords).
* Keywords: “sustainability,” “business,” “innovation”
* Central Articles:
* OTTERBACH N, 2024, RESOUR CONSERV RECYCL (Pagerank: 0.248): Focuses on resource conservation and recycling within a sustainability context.
* PIERONI M, 2016, PROCEDIA CIRP (Pagerank: 0.209): Might explore sustainable manufacturing practices or circular economy principles.
* VAN OPSTAL W, 2025, RESOUR, CONSERV RECYCL ADV (Pagerank: 0.202): A forward-looking article (2025) related to resource conservation and recycling, potentially exploring advanced or future trends.
* Inferences: This cluster is related to sustainability. It exists on its own, and should be connected to the other clusters. The journals involved suggest a focus on resource management, circular economy, and waste reduction. The keywords “business” and “innovation” suggest the theme is developed internally, but has few connections to the other clusters.
Synthesis and Overall Interpretation
- The strategic map highlights three key themes: “Manufacture,” “Product-Service Systems,” and “Sustainability.”
- “Manufacture” represents the core of the research field, while “Product-Service Systems” serves as a fundamental building block.
- “Sustainability” is a well developed research area but does not have much centrality.
- The relative positions suggest that while all themes are present in the literature, their integration might be an area for further research. For example, how can manufacturing processes be better integrated with product-service systems to improve overall sustainability?
Limitations and Considerations
- Keyword-Based: The analysis is based on keywords. The choice of keywords and the merging process (KW\_Merged) can significantly influence the results.
- SCOPUS Database: The results are specific to the SCOPUS database. Using a different database might yield different results.
- Parameters: The parameters used to generate the map (e.g., `n=250`, `minfreq=4`) will affect the structure of the map. Different parameter settings might reveal different relationships between themes. The `community.repulsion=0` and `repel=FALSE` settings might lead to overlapping clusters if themes are closely related. The fact that the parameters are “KW_Merged; n: 250; minfreq: 4; ngrams: 1; stemming: FALSE” can give you some hints on how the keywords have been analyzed. For example, you do not have to consider the plural form of the keywords and you know that each keyword has been selected if present more than 4 times.
- Time Dynamics: This is a static snapshot. A longitudinal analysis would reveal how these themes have evolved over time.
- Walktrap Algorithm: The “walktrap” algorithm is a community detection algorithm that identifies clusters based on random walks within the network. The results should be interpreted with an understanding of how this algorithm works.
Recommendations for Further Analysis
- Explore keyword co-occurrence: Analyze the co-occurrence of keywords across different clusters to identify potential bridges between themes.
- Perform a longitudinal analysis: Examine how the centrality and density of these themes have changed over time.
- Analyze the cited references: Identify the key publications cited by articles in each cluster to understand the intellectual foundations of each theme.
- Experiment with different parameters: Generate strategic maps using different parameters to explore the sensitivity of the results.
- Consider other clustering algorithms: compare the results with other clustering algorithms
By considering these insights and limitations, you can develop a more nuanced understanding of the research landscape and identify potential avenues for future research. Good luck!



Factorial Analysis
Overall Structure:
The map is a two-dimensional representation of the relationships between keywords (“KW_Merged”) extracted from the SCOPUS database. It’s based on Multiple Correspondence Analysis (MCA), a technique used to visualize relationships between categorical variables. Dimension 1 (Dim 1) explains 42.71% of the variance, while Dimension 2 (Dim 2) explains 13.55%. This suggests that Dim 1 is the primary driver of the separation of keywords, capturing the most significant distinctions within the dataset.
Key Observations:
1. Horizontal Differentiation (Dim 1):
* The dominant feature is the separation along the horizontal axis (Dim 1). The extreme left of the map is characterized by keywords like “business,” “circular business model,” and “innovation”.
* The central region encompasses terms such as “Industry 4.0”, “Circular Economy”, “Servitization”, “PSS”, and “Sustainable Development”.
* The extreme right includes keywords like “products and services”, “manufacturing industries”, “business modeling”, “product design” and “sales”. This axis seems to distinguish between a focus on (left) overall strategies, business models, and early-stage concepts, (central) a mid-spectrum of product/service offerings and more concrete business operations, and (right) a later stage of tangible products, the outcome of the design and business model and the process of manufacturing itself.
2. Vertical Differentiation (Dim 2):
* The vertical axis (Dim 2) contributes less to the overall variance but still offers insights.
* The top portion includes terms like “business,” “manufacturing,” “innovation,” and “economics,” “products and services,” suggesting a focus on broader market and high-level strategic considerations.
* The bottom portion features terms like “smart products,” “case studies,” and “value proposition,” indicating a more detailed or applied focus, potentially related to specific technologies, methodologies, or business functions.
3. Clusters and Associations:
* Several clusters are apparent.
* Cluster 1 (Left): “Business”, “Innovation,” “Circular Business Model.” This suggests a focus on innovative and alternative business approaches, possibly related to sustainability.
* Cluster 2 (Center): “Industry 4.0,” “Circular Economy,” “Servitization,” “PSS,” “Sustainable Development,” “Environmental Impact.” This indicates a strong connection between technological advancements, sustainability paradigms, and service-oriented business models. This likely represents research focusing on the application of Industry 4.0 principles to achieve sustainability through circular economy and servitization.
* Cluster 3 (Right): “Products and Services”, “Manufacturing Industries”, “Business Modeling”, “Product Design”, “Sales”. This suggests a research stream focusing on the traditional industrial model but incorporating business modelling and product design aspects.
* Cluster 4 (Bottom): “Smart Products”, “Value Proposition”, “Case Studies”, “Business Models”. This cluster seems to focus on the tangible elements and validation methods of businesses, likely looking into how smart products can create new value for a business, validated via case studies.
Interpretation and Discussion Points for Researchers:
- Underlying Themes: The map highlights two dominant themes: a focus on new business models and strategies focused on circular economy and innovation (left), the integration of sustainability principles with technological advancements (center) and the products related to it, and lastly a cluster more related to sales of these products.
- Bridging Research Areas: The proximity of “Industry 4.0” and “Circular Economy” suggests an intersection of research interests. Researchers might investigate how Industry 4.0 technologies can enable circular economy principles in various sectors.
- Strategic vs. Operational Focus: The vertical axis suggests a differentiation between strategic, high-level considerations (top) and more operational, application-oriented research (bottom). This could be used to analyze the balance of research in the field.
- Missing Links: Consider terms that are *not* present or are located far from the main clusters. This could reveal gaps in the research or emerging areas that require more attention. Are there relevant keywords missing from the analysis?
- Limitations: Remember that MCA is a descriptive technique. The map reveals associations, but it doesn’t necessarily imply causation.
- Parameter Impact: The `minDegree = 22` parameter means that only keywords appearing in at least 22 documents are included. This might exclude some niche but relevant topics. Consider the impact of this threshold on the results.
- Further Analysis: Explore the documents associated with specific keywords or clusters to gain a deeper understanding of the research context. Consider using other bibliometric techniques (e.g., co-citation analysis) to complement these findings.
In summary, this factorial map provides a valuable overview of the intellectual structure of the research field represented by your SCOPUS dataset. By analyzing the clusters, keyword positions, and the variance explained by each dimension, you can identify key themes, research gaps, and potential areas for future investigation.

Co-citation Network
Overall Structure and Interpretation
This is a co-citation network of cited references. This means that the nodes in the network represent specific publications (identified by author and year), and the links (edges) between the nodes indicate that these two publications were cited together in the same citing papers. In essence, publications that are frequently co-cited are considered to be conceptually related by the researchers doing the citing. The stronger the link (i.e., the thicker the line), the more frequently the two publications were co-cited. The size of the node is typically proportional to the number of citations the corresponding paper has received within the analyzed dataset. The ‘Walktrap’ clustering algorithm was used to identify communities within the network. Walktrap aims to find densely connected regions, effectively clustering papers that are often cited together. This reveals groups of publications that share a common intellectual foundation or research focus.
Key Observations Based on the Provided Image and Parameters
1. Community Structure: The network clearly shows distinct communities, visually represented by different colors (red, blue, green, orange, purple). This indicates that there are identifiable clusters of research within your dataset. Each community likely represents a specific subfield, methodological approach, or theoretical perspective.
* Green Cluster: Centered around “tukker a. 2004-2”, “oliva r. 2003”, and “tukker a. 2004-1”, this cluster seems to be focused on a specific research area related to the work of these authors. Given the prominence of Tukker’s work, this might relate to Industrial Ecology, Sustainable Product Design, or similar fields. The presence of “Mont o.k.” suggests a link to design for environment topics.
* Blue Cluster: With “reim w. -1” as a central node, this cluster appears to be a significant area of research with strong connections. The other nodes in this cluster might indicate the specific focus within this cluster. The prescence of Esterwalder suggests that the focus is on Business Model Innovation.
* Red Cluster: The red cluster seems more recent, with papers from 2014-2016. Given the presence of “tukker a. 2015-1”, “tukker a. 2015-2” there is a chance that it is an evolution of the topics addressed in the green cluster (industrial ecology, design for envrionment, etc.)
* Orange and Purple Clusters: These are smaller and more isolated, suggesting they represent distinct and potentially less integrated areas within your dataset. The position of Chowdhury suggests topics related to big data, information systems. The presence of Valencia suggests topics related to innovation and/or Operations Management
2. Central Nodes: The nodes with the largest size indicate highly influential and frequently co-cited publications.
* “reim w. -1”: This paper is clearly a central hub in the network, suggesting it has significantly influenced the field. The negative number might indicate that a few papers from the same author and year were merged.
* “tukker a. 2004-1”, “tukker a. 2004-2”, “oliva r. 2003”: These are also prominent nodes, particularly within the green cluster, reinforcing their importance.
3. Edges (Links): The thickness of the edges reflects the strength of the co-citation relationship. Stronger edges indicate that these papers are very frequently cited together, suggesting a close intellectual link.
Interpretation Guidance & Critical Discussion Points
1. Community Focus:
* What are the key themes, methodologies, or theories that define each community? To answer this, look into the content of the most central publications in each community.
* Are there any surprising or unexpected groupings? Do these suggest interdisciplinary connections or emerging research trends?
* How do the communities relate to each other? Are there bridging publications that connect different communities? Understanding the relationships between communities can reveal broader trends in your field.
2. Central Nodes & Influential Publications:
* What are the main contributions of the most central publications (e.g., “reim w. -1”, “tukker a. 2004-1”, “oliva r. 2003”)? Why are they so influential? Do they present groundbreaking methodologies, seminal theoretical frameworks, or pivotal empirical findings?
* Are there any “sleeping beauties” – publications that were initially overlooked but have gained prominence over time? Examine publications with low initial citations but strong recent co-citation links.
3. Network Structure:
* Is the network highly centralized (dominated by a few key nodes) or more decentralized (with a more even distribution of influence)? A centralized network might suggest a field with a strong consensus around core ideas, while a decentralized network could indicate greater diversity and fragmentation.
* Are there any isolated nodes or small clusters? These might represent niche areas of research or emerging topics that are not yet well-integrated into the broader field.
4. Temporal Trends:
* Consider the publication years of the most influential papers. Are there any shifts in the dominant research themes or methodologies over time? For example, is the red cluster more recent?
* You could further analyze this by looking at the average publication year within each cluster, or by creating time-slice networks to see how the network structure evolves over time.
5. Database Specificity (SCOPUS):
* Remember that this analysis is based on SCOPUS data. SCOPUS has strengths and weaknesses in terms of coverage. Be mindful that your results may be different if you used Web of Science, for example.
Next Steps for Your Research
1. Examine the Content: Read the abstracts and key sections of the most influential papers in each community to understand their main contributions.
2. Consult the Literature: Search for review articles or meta-analyses that discuss the key themes and debates within each community.
3. Consider Alternative Network Parameters: Experiment with different clustering algorithms or network visualization parameters to see if different patterns emerge.
4. Compare to Other Datasets: If possible, replicate the analysis using data from other bibliographic databases to assess the robustness of your findings.
By carefully considering these points, you can move beyond a purely descriptive analysis of the co-citation network and develop a deeper, more nuanced understanding of the intellectual structure and dynamics of your field. Good luck!


Historiograph
Overall Structure and Temporal Trends:
- Early Foundation (2004-2006): The historiograph clearly indicates that the work of Tukker et al. (2004) is a foundational paper, serving as a central node with numerous connections. This article, “Service-Oriented Manufacturing: A New Product Mode And Manufacturing Paradigm”, appears to be seminal in establishing the field. Papers by Besch (2005) and Mont (2006) are also positioned early in the network, suggesting they contributed to the initial framing of the research area, even though it is not possible to understand the exact argument without the abstracts.
* Elaboration and Expansion (2010-2016): A significant cluster of publications emerged in the period between 2010 and 2016. This suggests a period of active research and development in the field. These publications expand the topics of the initial paper. Some notable areas of focus within this cluster include:
* Dynamic IPS2 Networks and Software Agents (Meier, 2010): Research focuses on implementation and operation based on software agents.
* RFID-Enabled Systems (Annarelli, 2016; Gaiardelli, 2014): A visible path focuses on RFID and real-time manufacturing applications within the PSS context, especially in the automotive industry.
* Sustainability Considerations (Parida, 2014; Richter, 2010): There’s an integration of sustainability principles into PSS design and engineering.
* Recent Developments (2017-2019): The most recent publications build upon the earlier work, exploring specific applications, frameworks, and strategic considerations. Key observations from this period:
* Frameworks and Design (Adrodegari, 2017): Focus is on developing frameworks for sustainable PSS design.
* Business Model Integration (Linder, 2017): Integration of business model strategies in PSS design, as indicated by the case study on urban umbrella rental.
* Handbook of Sustainable Engineering (Yang, 2019): A Handbook of Sustainable Engineering tries to summarize all the previous efforts.
Key Observations and Interpretations:
1. Tukker’s Seminal Role: The prominent position of Tukker’s 2004 paper confirms its importance in defining the initial scope and direction of research on service-oriented manufacturing and PSS. It is possible that other documents cite this for being a key paper in describing the servitization of manufacturing.
2. Evolution towards Application and Implementation: The field has progressed from initial conceptualization to practical application and implementation. This is evidenced by the increasing number of publications focusing on RFID-enabled systems, specific industry applications (e.g., automotive), and sustainable design frameworks.
3. Sustainability as a Growing Theme: The inclusion of “sustainability” in several titles (Parida, Richter, Yang) indicates an increasing awareness and integration of sustainability considerations within the PSS research area.
4. Emergence of Design Frameworks: The focus on design frameworks (Adrodegari, Linder) suggests an attempt to systematize and formalize the PSS design process, making it more accessible and applicable to practitioners.
Suggestions for Further Analysis:
- Keyword Analysis: Perform a keyword analysis of the titles and abstracts to identify the most frequently used terms and track their evolution over time. This can provide deeper insights into the specific topics and trends within the research area.
- Author Collaboration Network: Analyze the co-authorship patterns to identify key research groups and collaborations. This can reveal the social structure of the research community.
- Content Analysis: Conduct a more in-depth content analysis of the key publications to understand the specific methodologies, findings, and contributions of each paper.
Limitations:
- This interpretation is based solely on the titles and publication years of the articles. A deeper understanding would require access to the abstracts and full text of the articles.
- The historiograph visualizes direct citations only. Indirect connections and broader intellectual influences are not captured.
- The database (SCOPUS) used for this analysis influences the scope and coverage of the results.
In conclusion, the historiograph reveals a research area that has evolved from initial conceptualization and definition (Tukker, 2004) to a more mature phase characterized by application, implementation, and a growing emphasis on sustainability and systematic design frameworks. The field appears active and continues to evolve, with ongoing research exploring new applications and approaches to PSS.

Collaboration Network
Overall Network Structure:
- Dispersed Network: The network appears somewhat dispersed, indicating that while collaboration exists, there isn’t a single, highly interconnected core group of researchers. Instead, we observe multiple distinct clusters or communities. This could mean that the research area is fragmented into sub-disciplines or that collaboration is more localized within specific institutions or research groups.
- Multiple Communities: The use of the Walktrap algorithm for community detection has identified several distinct communities, each represented by a different color. This suggests the existence of subgroups within the author network that collaborate more frequently among themselves than with authors outside their group.
Community Analysis:
- Community Size and Centrality: The size of each community gives a general indication of the number of researchers active within that particular sub-area. The position of nodes (authors) within a community relates to their influence and connectivity within that group. Authors located more centrally within their community likely play a more significant role in facilitating collaboration and knowledge dissemination within that group.
- Key Communities and Central Authors:
* Orange Community: The orange community, features authors like ‘salpezzotta g’, ‘cavalieri s’, ‘saccani n’, ‘medini k’, and ‘terzi s’. Given ‘salpezzotta g’ size relative to the others in that cluster, it might be interpreted as a central figure of this community. It is the most prominent cluster within the network.
* Grey Community: ‘Parida’ is the most prominent author in this cluster.
* Red Community: This community feature authors such as ‘evans s’ and ‘holgado m’.
- Interpretation of Communities: To understand what these communities represent, we need to consider the underlying research topics. Are these communities based on specific sub-fields, methodologies, or research questions? You can investigate this by looking at the publications of the authors within each community.
Most Connected Terms (Labeled Nodes):
- The `label.n=50` parameter displays the top 50 most connected authors (nodes) in the network. The size of the labels likely corresponds to their degree centrality (number of connections).
- Interpreting Relevance: The prominence of certain author names in the network can point to key researchers or research groups in your dataset. It’s worth investigating their publications to understand their contribution to the field.
- ‘salpezzotta g’ and ‘parida’: These are the 2 most prominent author in this network and they appear to be part of a different cluster from each other.
Parameter Considerations:
- Normalization (“association”): Using “association” as the normalization method emphasizes relationships where authors tend to co-author more frequently than expected by chance.
- Community Repulsion: The community repulsion parameter (`community.repulsion=0.05`) helps separate the communities visually.
- Edge Weight and Alpha: The edge size (`edgesize=15`) and alpha (`alpha=0.7`) control the visibility of the connections. Thicker and less transparent edges suggest stronger collaborative ties.
Next Steps for Deeper Analysis:
1. Examine the Publications: Analyze the publications of the most connected authors and the publications within each community. This will help you identify the key research themes and topics associated with each group.
2. Investigate Author Affiliations: Determine the institutional affiliations of the authors. Are the communities centered around specific universities, research labs, or geographical regions?
3. Consider the Timeframe: Analyze the publication dates in your dataset. Are the communities emerging and evolving over time? Are there new collaborations forming or existing collaborations dissolving?
4. Refine the Analysis: Experiment with different clustering algorithms (e.g., Louvain, Infomap) and parameters in Biblioshiny to see if you can identify different or more refined community structures.
By combining this network analysis with a closer examination of the underlying publications, you can gain valuable insights into the structure of collaboration within your research area, the key players, and the emerging trends.


Countries’ Collaboration World Map
Key Observations:
1. Major Hubs of Scientific Production:
* United States: Clearly a dominant force, as evidenced by the intense blue shading.
* Western Europe (Germany, UK, France, Italy, Netherlands, Spain): The high density of links and darker shading indicates a central role in global research output and collaboration. Germany seems to be a particularly important hub within Europe.
* China: Also shows high scientific production.
* Australia: The high density of blue indicates considerable scientific production.
2. Key International Partnerships:
* Transatlantic Collaboration (US – Europe): The thickness and density of lines between the US and Europe (especially Germany, the UK, and France) highlight a very strong and frequent collaborative relationship.
* US-China Collaboration: Noticeable collaboration between the United States and China, reflecting the increasing importance of scientific partnership between these two countries.
* European Collaboration: A significant amount of collaboration occurs *within* Europe itself, linking various countries in the region.
* Collaboration with Brazil: There’s collaboration between Brazil and North America and European Countries.
* Collaboration with Australia: The map shows collaborations between Australia, China, North America and European countries.
3. Global Patterns of Collaboration:
* Core-Periphery Pattern: A visible core-periphery pattern exists, with the US, Europe, and China at the core, collaborating with a wider range of countries around the world. Countries with lighter shading (e.g., in Africa, South America, and parts of Asia) appear to have fewer publications and may be more often on the receiving end of collaborations.
* North-South Collaboration: While strong North-North collaborations (e.g., US-Europe) are evident, there are also collaborations between the global North (US, Europe, Australia) and countries in the global South (e.g., Brazil, some African countries). The thickness of these lines might suggest the strength of these collaborations, though more detailed data would be needed to confirm this.
* Regional Collaborations: In addition to global collaborations, the map shows regional collaborations. For example, strong collaboration within Europe is evident.
Interpretation & Discussion Points:
* Dominance of Western Science: The map strongly reflects the historical dominance of Western (US and Europe) science in global research. This is not surprising given the longer history of scientific institutions and funding in these regions.
* Rise of China: The prominence of China demonstrates its growing scientific influence and investment in research. The collaborations with the US and Europe indicate its integration into the global scientific community.
* Importance of International Collaboration: The high number of lines indicates that scientific research is increasingly a global endeavor. Collaboration allows researchers to access diverse expertise, resources, and perspectives, potentially leading to higher-impact research.
* Data Limitations: The map only represents *co-authorship* as a measure of collaboration. It doesn’t capture other forms of collaboration, such as data sharing, joint grant applications, or informal knowledge exchange. Also, SCOPUS may have a bias toward English-language publications, which could affect the representation of certain countries.
* Considerations for Further Analysis:
* Field-Specific Analysis: How do these collaboration patterns vary across different scientific disciplines? Some fields might have more global collaboration than others.
* Temporal Trends: How have these patterns changed over time? Is collaboration increasing, decreasing, or shifting among different countries?
* Citation Impact: Do international collaborations lead to higher citation rates? Analyzing the citation impact of collaborative papers compared to single-country papers could provide further insights.
Suggestions for Your Research:
- Use this map as a starting point for more detailed investigations. For example, focus on specific regions or countries of interest and analyze their collaboration networks in more detail.
- Consider overlaying this map with other data, such as GDP, research funding levels, or SDG indicators, to explore potential relationships between scientific collaboration and other factors.
- Be mindful of the limitations of bibliometric data and consider supplementing your analysis with qualitative data, such as interviews with researchers involved in international collaborations.
By critically evaluating this map in light of its strengths and limitations, you can gain valuable insights into the dynamics of global scientific collaboration and its implications for your research field. Remember to acknowledge SCOPUS as your data source when presenting your findings.
