CWTS Leiden

CWTS Leiden

CWTS Leiden is a research institute at Leiden University specializing in bibliometrics and scientometrics, producing quantitative analyses used by European Commission, Organisation for Economic Co-operation and Development, United Nations Educational, Scientific and Cultural Organization, and national research councils. The institute collaborates with universities such as University of Oxford, University of Cambridge, Harvard University, Stanford University, and University of Tokyo while contributing to policy debates involving Horizon 2020, Framework Programme 7, Erasmus Programme, and national funding agencies. CWTS Leiden is known for developing indicators, databases, and rankings that inform institutions including Max Planck Society, CNRS, National Institutes of Health, and Wellcome Trust.

History

CWTS originated from initiatives at Leiden University during the 1980s, influenced by early work at Institute for Scientific Information, Royal Society, and researchers such as Derek J. de Solla Price. The centre institutionalized collaborations with entities like European Research Council, Royal Netherlands Academy of Arts and Sciences, KNAW, and bilateral projects with Netherlands Organisation for Scientific Research and Ministry of Education, Culture and Science. Across the 1990s and 2000s CWTS engaged with the Science Citation Index, Scopus, and Web of Science data providers, while interacting with consortia such as GESIS and CrossRef. CWTS staff published alongside scholars from University of Leiden Medical Center, Karolinska Institutet, University of Amsterdam, and University College London, influencing evaluative tools used by European University Association and national assessment exercises like Research Excellence Framework and Austrian Science Fund evaluations.

Methodology and Metrics

CWTS methodologies build on citation indexes such as Web of Science, Scopus, and datasets from CrossRef, integrating classification schemes influenced by Library of Congress and subject taxonomies used by National Science Foundation. Techniques include fractional counting developed in discussion with groups at École Polytechnique Fédérale de Lausanne and normalization procedures debated with scholars from University of Leiden, Ghent University, University of Utrecht, Tilburg University, Maastricht University, and University of Groningen. CWTS introduced indicators related to field-normalized citation impact that have been compared with metrics from Eigenfactor Foundation, Google Scholar, Microsoft Academic, and tools used by Clarivate Analytics. The centre employs statistical frameworks drawn from collaborations with researchers at Imperial College London, ETH Zurich, Princeton University, University of Chicago, and Columbia University to address skewness, outliers, and citation windows. Methodological outreach includes workshops with UNESCO, training for staff at European Space Agency, and input to standards from International Organization for Standardization committees.

Leiden Ranking

The Leiden Ranking produced by the centre compares higher education institutions using bibliometric indicators, attracting attention from Times Higher Education, QS World University Rankings, Shanghai Jiao Tong University, Academic Ranking of World Universities, and data consumers such as US News & World Report. The ranking emphasizes size-independent indicators and collaborates with data partners like Elsevier, Clarivate, and CWTS INCHER-BV affiliates. Universities featured include University of California, Berkeley, Massachusetts Institute of Technology, University of Oxford, University of Cambridge, ETH Zurich, Peking University, Tsinghua University, University of Toronto, National University of Singapore, Australian National University, and many others. The ranking methodology has been cited in policy documents by European Commission Horizon, OECD Science, Technology and Industry Directorate, and national evaluation frameworks in Sweden, Denmark, Germany, France, and Spain.

Applications and Impact

Institutions use CWTS outputs for strategic planning at universities such as Utrecht University, Leiden University Medical Center, King's College London, University of Melbourne, Seoul National University, University of São Paulo, and University of Cape Town. Funding agencies including Wellcome Trust, Bill & Melinda Gates Foundation, European Research Council, Japan Society for the Promotion of Science, and Canadian Institutes of Health Research have referenced CWTS analyses in calls and evaluations. International consortia such as LISBON Council, Global Research Council, European University Association, Association of Commonwealth Universities, and Association of American Universities have engaged with CWTS for comparative studies. The centre's bibliometric tools inform research management offices, tenure committees, and science policy units at institutions like Princeton University, Yale University, Cornell University, University of Pennsylvania, Duke University, and Johns Hopkins University.

Criticisms and Controversies

CWTS has faced critique from scholars at University of Amsterdam, Vrije Universiteit Amsterdam, Leiden University, University of York, and advocacy groups such as Science Europe over reliance on citation-based indicators similar to debates involving Journal Impact Factor and practices promoted by San Francisco Declaration on Research Assessment. Critics referencing work by Loet Leydesdorff, Ismael Rafols, Stevan Harnad, Richard Horton, and Sally Wyatt argue that metrics can produce perverse incentives discussed in reports by The Royal Society, Academy of Sciences, and European Science Foundation. Debates center on coverage issues with Scopus and Web of Science, disciplinary classification disputes involving humanities departments at University of Barcelona and University of Bologna, and reproducibility concerns raised alongside researchers at Open Science Framework and Center for Open Science. CWTS responses have included methodological revisions influenced by dialogue with DORA, COPE, SPARC, and international advisory boards.

Category:Leiden University