Ludo Waltman is Professor of Quantitative Science Studies at Centre for Science and Technology Studies, Leiden University and Deputy Director at Centre for Science and Technology Studies, Leiden University

Profile page

Blogs

Shaping the Future of Open Research Information - Reflections from the National Open Science Festival

At the National Open Science Festival, we explored challenges in implementing the Barcelona Declaration, including vendor lock-in, data quality, cultural resistance and advocacy gaps. Participants brainstormed actionable solutions, highlighting collaboration, training and outreach as key drivers.

Ana Ranitovic, Jeroen Bosman and Ludo Waltman • December 18, 2024

Opening the black box of university rankings

Today two university rankings were released, one by CWTS and one by Times Higher Education. Ludo Waltman and Nees Jan van Eck, responsible for the CWTS Leiden Ranking, use this occasion to discuss the importance of transparency of rankings.

Ludo Waltman and Nees Jan van Eck • October 09, 2024

Launch of the CWTS Leiden Ranking Open Edition 2024

Earlier this year CWTS published the first Open Edition of the CWTS Leiden Ranking. Today the Leiden Ranking Open Edition 2024 was launched. In this post, Nees Jan van Eck and colleagues discuss the latest developments around the Open Edition of the Leiden Ranking.

Nees Jan van Eck, Ludo Waltman and Mark Neijssel • October 09, 2024

Bezuiniging op Open Science NL, superzonde!

Afgelopen week werd een forse bezuiniging op Open Science NL bekendgemaakt. Ludo Waltman, open science ambassadeur van Universiteit Leiden, bespreekt de gevolgen van deze bezuiniging.

Ludo Waltman • September 25, 2024

Introducing the Leiden Ranking Open Edition

This post introduces the Open Edition of the CWTS Leiden Ranking, published today by CWTS in collaboration with the Curtin Open Knowledge Initiative, Sesame Open Science, and OurResearch. The Leiden Ranking Open Edition is the first fully transparent university ranking.

Ludo Waltman, Nees Jan van Eck, Martijn Visser, Mark Neijssel, Lucy Montgomery, Cameron Neylon, Bianca Kramer, Kyle Demes and Jason Priem • January 30, 2024

Opening up the CWTS Leiden Ranking: Toward a decentralized and open model for data curation

Today, CWTS released the Open Edition of the Leiden Ranking. This blog post discusses the data curation approach taken in this fully transparent edition of the Leiden Ranking.

Nees Jan van Eck, Martijn Visser and Ludo Waltman • January 30, 2024

An open approach for classifying research publications

In this post Nees Jan van Eck and Ludo Waltman introduce an open approach for classifying research publications, contributing to a broader development toward open approaches to bibliometrics.

Nees Jan van Eck and Ludo Waltman • January 24, 2024

Preprinting and open peer review at the STI 2023 conference: Evaluation of an open science experiment

At the STI 2023 conference, an experiment was performed with a more open approach to publication and peer review of conference submissions. In this post, the conference organisers present an evaluation of this experiment.

Ludo Waltman, Biegzat Mulati, Rong Ni, Jian Wang, Kwun Hang (Adrian) Lai, Marc Luwel, Ed Noyons, Thed van Leeuwen and Verena Weimer • December 18, 2023

The Leiden Ranking goes beyond ranking

Today the CWTS Leiden Ranking and the INORMS More Than Our Rank initiative announce a new partnership, aimed at highlighting the accomplishments of universities beyond what is captured in university rankings.

Elizabeth Gadd, Ludo Waltman and Nees Jan van Eck • September 27, 2023