Centre for Science and Technology Studies Centre for Science and Technology Studies 2333AL Leiden Zuid Holland 31715273909

Centre for Science and Technology Studies

The Centre for Science and Technology Studies (CWTS) studies scientific research and its connections to technology, innovation, and society. Our research, bibliometric and scientometric tools, and evaluation expertise provide a solid basis for supporting research assessment and strategic decision making and for developing science policy.



  • Municipal boundaries hinder economic growth

    A few years ago Ton van Raan, emeritus professor of Quantitative Science Studies at CWTS, demonstrated that universities show a similar scaling behavior as cities in the distribution of the ‘gross university income’ in terms of total number of citations over ‘size’ in terms of total number of publications. Moreover, the power law exponents for university scaling are comparable to those for urban scaling.

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  • Zohreh Zahedi successfully defends her PhD thesis

    On December 12 our colleague Zohreh Zahedi successfully defended her PhD dissertation entitled “Understanding the Value of Social Media Metrics for Research Evaluation”.

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  • CWTS chooses new leadership - Sarah de Rijcke new director

    The Centre for Science and Technology Studies (Leiden University) has adopted a new governance structure. As of January 1, 2019, the centre will be led by Prof. Sarah de Rijcke, who has been appointed by the board of the Faculty of Social and Behavioral Sciences (FSW) as the new scientific director for a period of 4 years. 

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  • Is it a scientific breakthrough?

    Only a small minority of all scientific publications contain genuine scientific breakthroughs. It takes, in general, a considerable amount of time before a scientific discovery is recognized as a breakthrough. We show that combining decision heuristics with algorithms that analyse the response of the scientific community to a research publication enables the detection of breakthroughs at an early stage.

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  • The evaluative inquiry: a new approach to academic evaluation

    The evaluative inquiry is a promising new approach to research evaluation. Here are four moves to give shape to its methodology, focus, analysis and ambitions.

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  • Using the Leiden algorithm to find well-connected clusters in networks

    An exciting development in the field of quantitative science studies is the use of algorithmic clustering approaches to construct article-level classifications based on citation networks. Until recently, most classifications were based on categorizing journals rather than individual articles. This is understandable given the substantial challenges of classifying millions of articles. At CWTS, we now routinely work with article-level classifications. We have dedicated quite some time developing clustering algorithms for creating these classifications. These algorithms have an impact beyond our own research field and are of interest to many network scientists.

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