Ludo Waltman
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ludowaltman.bsky.social
Ludo Waltman
@ludowaltman.bsky.social
Scientific Director Centre for Science and Technology Studies (CWTS), Leiden University; Open Science Ambassador Leiden University; Co-chair Research on Research Institute (RoRI); President ASAPbio; Editor-in-Chief MetaROR (MetaResearch Open Review)
Reposted by Ludo Waltman
TU/e has gained a new research centre: META/e. Daniël Lakens and Krist Vaesen were among the founders of this knowledge hub for metascience—research aimed at improving the practice of science itself. “We want to be a home for every researcher who occasionally wonders: what are we even doing?”
Knowledge centre META/e: home for those improving science
TU/e has gained a new research centre: META/e. Daniël Lakens and Krist Vaesen were among the founders of this knowledge hub for metascience—research aimed at improving the practice of science itself. ...
www.cursor.tue.nl
November 13, 2025 at 2:50 PM
Reposted by Ludo Waltman
Great to see that cOAlition S is going to enhance its "focus on sustainable and equitable models, such as PRC, diamond open access and preprints".

This aligns with some of the work we are doing at @cwts.nl and in @rorinstitute.bsky.social.
1/ cOAlition S announces its 2026–2030 strategy, guided by a refreshed, shared vision: a scholarly communication system that enables rapid, open, transparent & equitable sharing of trustworthy scientific knowledge.
www.coalition-s.org/coalition-s-...
#OpenScience #ScholarlyComm #Plan_S #OpenAccess
November 12, 2025 at 6:33 PM
Great to see that cOAlition S is going to enhance its "focus on sustainable and equitable models, such as PRC, diamond open access and preprints".

This aligns with some of the work we are doing at @cwts.nl and in @rorinstitute.bsky.social.
1/ cOAlition S announces its 2026–2030 strategy, guided by a refreshed, shared vision: a scholarly communication system that enables rapid, open, transparent & equitable sharing of trustworthy scientific knowledge.
www.coalition-s.org/coalition-s-...
#OpenScience #ScholarlyComm #Plan_S #OpenAccess
November 12, 2025 at 6:33 PM
Reposted by Ludo Waltman
Join RoRI Co-Chair @ludowaltman.bsky.social in Cambridge on 3 Dec, where he'll be a keynote at a forum exploring the Publish, Review, Curate model.

The event will showcase initiatives and discuss how this model can shape the future of scholarly communication: coar-repositories.org/news-updates...
November 12, 2025 at 12:44 PM
Very proud of @eleonoradagiene.bsky.social. It was a great pleasure to supervise her PhD research!
🎓 Last week, Dr. Eleonora Dagiene successfully defended her PhD thesis titled 'Quantitative research assessment and its unintended consequences' at Leiden University.

Congratulations on this amazing achievement!! 🥂

www.universiteitleiden.nl/en/news/2025...
Congratulations, Dr. Eleonora Dagienė!
On 30 October 2025, Eleonora Dagienė successfully defended her PhD thesis at Leiden University, titled ‘Quantitative Research Assessment and its Unintended Consequences’.
www.universiteitleiden.nl
November 7, 2025 at 11:08 AM
Reposted by Ludo Waltman
Nederland koploper met 95% OA, maar vernieuwing strategie is nodig www.universiteitenvannederland.nl/actueel/nieu...

"Universiteiten willen meer grip krijgen op hoe wetenschappelijk onderzoek wordt gepubliceerd en hoe we de autonomie van wetenschappers op ... publicatieprocessen kunnen verhogen."
Nederland koploper met 95 procent Open Access, maar vernieuwing strategie is nodig
Sinds 2016 is het percentage open toegankelijke peer-reviewed artikelen gestegen van 42 procent open access naar 95 procent in 2024. Daarmee is Nederland een koploper in de wereld. Caspar van den Berg...
www.universiteitenvannederland.nl
November 6, 2025 at 8:30 PM
Reposted by Ludo Waltman
Nederland koploper met 95% OA, maar vernieuwing strategie is nodig www.universiteitenvannederland.nl/actueel/nieu...

"Universiteiten willen meer grip krijgen op hoe wetenschappelijk onderzoek wordt gepubliceerd en hoe we de autonomie van wetenschappers op ... publicatieprocessen kunnen verhogen."
Nederland koploper met 95 procent Open Access, maar vernieuwing strategie is nodig
Sinds 2016 is het percentage open toegankelijke peer-reviewed artikelen gestegen van 42 procent open access naar 95 procent in 2024. Daarmee is Nederland een koploper in de wereld. Caspar van den Berg...
www.universiteitenvannederland.nl
November 6, 2025 at 8:30 PM
Reposted by Ludo Waltman
Congratulations to us, and thank you, @kohli-sociology.bsky.social!
November 5, 2025 at 3:33 PM
Work by @rorinstitute.bsky.social project team has been peer reviewed openly on the @metaror.bsky.social platform.

Nice demonstration of the commitment of RoRI colleagues to MetaROR's publish-review-curate model!
How are national systems for assessing publicly funded research evolving? That's the question our latest article poses.

Reviewers consider the work "valuable and timely", noting its relevance to reform initiatives like @coarassessment.bsky.social

👇 Read the assessment, reviews & full article here
A new typology of national research assessment systems: continuity and change in 13 countries
metaror.org
November 4, 2025 at 9:20 PM
Reposted by Ludo Waltman
What better time than #OAWeek to share 13 actions researchers can take for fairer, more sustainable publishing? From posting preprints to supporting diamond journals to refusing to review for exploitative publishers: each small action matters when we act collectively.
October 22, 2025 at 7:57 PM
"communities have been creating their own spaces to freely publish, discuss, and consume their research, from domain-specific preprint communities to grassroots publishing platforms ..."
November 3, 2025 at 7:05 PM
Reposted by Ludo Waltman
📰 Opinion piece (in Dutch) in the Dutch newspaper Het Financieele Dagblad by our scientific director @ludowaltman.bsky.social. Reacting to an earlier opinion piece, he argues for why universities are right to step away from the big commercial university rankings 👇
November 3, 2025 at 1:22 PM
Reposted by Ludo Waltman
Rogue Scholar is becoming a German Non-Profit Organization
The science blog archive Rogue Scholar started the process of becoming a German non-profit organization in 2026. This blog post summarizes the reasoning and the main steps needed to achieve this. Two weeks ago, I published a self-assessment of how Rogue Scholar adheres to the Principles of Open Scholarly Infrastructure (POSI). Major gaps were identified in the areas of _governance_ and _sustainability_. To address these gaps, a major step forward would be to start a non-profit membership organization. The need to take this step at some point was obvious to me since I launched Rogue Scholar in April 2023. With the basic service operating and on a good path forward with 50,000 science blog posts archived by the end of the year, the time has arrived to make this step. Starting a non-profit membership organization in Germany means starting a _Verein_ , or registered association. The steps involved to formally register the association are clearly laid out and mainly involve the following: * at least seven founding members, * drafting statutes (_Satzung_), * founding general assembly with members approving statutes and electing a founding board, * registration at a local court, * registration for charitable status with the tax authorities. It helps that I have worked for non-profit organizations most of my professional life. Not only public universities, but also a non-profit publisher (PLOS), and two membership organizations (ORCID and DataCite), with the latter also being a German Verein. Interestingly, Research Organization Registry (ROR), an initiative that I helped launch in early 2019, is not a membership organization. Running a non-profit organization in Germany requires more paperwork compared to, for example, Belgium or the Netherlands, mainly to obtain and keep charitable status. This means a good amount of work for the founding board, especially the president and treasurer. One important question is the rights and responsibilities of members. As individuals or groups of people, rather than formal organizations, run many science blogs, membership has to be open to all legal entities, individuals and organizations. Membership fees should differentiate between individuals and organizations, and include at least two tiers for small and large organizations, for example: * individual 25 EUR/year * small organization 250 EUR/year * supporting organization 2500 EUR/year Rogue Scholar is a Diamond Open Access infrastructure with no fees to readers or authors. This means that membership can't be a requirement for a science blog to be archived in Rogue Scholar, but rather that membership comes with other benefits. Members not only help support a unique open scholarly infrastructure but also have a say in the governance of the organization via the general assembly, participation in the board, and potentially working groups going forward. For Rogue Scholar to achieve sustainability, membership fees are an important element. Two other aspects are also important: * **Volunteer labor** , particularly in the areas of outreach, support, and software development, becomes easier once Rogue Scholar has formal members * **Grant funding** , which becomes easier once Rogue Scholar obtains charitable status Please use Slack, email, Mastodon, or Bluesky if you have any questions or comments regarding Rogue Scholar becoming a non-profit membership organization. Rogue Scholar is a scholarly infrastructure that is free for all authors and readers. You can support Rogue Scholar with a one-time or recurring donation, by becoming a sponsor, or soon by becoming a member. ## References 1. Fenner, M. (2025, October 20). Rogue Scholar follows the Principles of Open Scholarly Infrastructure (POSI). _Front Matter_. https://doi.org/10.53731/m65a8-6sm21 2. POSI Adopters. (2025). _The Principles of Open Scholarly Infrastructure v2.0_. https://doi.org/10.14454/G8WV-VM65 3. Fenner, M. (2023, April 4). The Rogue Scholar is now open for business. _Front Matter_. https://doi.org/10.53731/z9v2s-bh329 4. California Digital Library, DataCite, Crossref, & Digital Science (United Kingdom). (2018). _The ROR of the crowd: Get involved!_. https://doi.org/10.71938/SNA1-ZC49
blog.front-matter.io
November 3, 2025 at 11:35 AM
Reposted by Ludo Waltman
Met @mareonline.nl had ik een boeiend gesprek over de publicatie- en andere problemen in de wetenschap. Meer horen? Volgende week dinsdag, de 11e van de 11e geef ik een lezing in Leiden: www.visitleiden.nl/nl/agenda/42...
November 3, 2025 at 8:52 AM
Reposted by Ludo Waltman
In het Financieele Dagblad beargumenteer ik dat universiteiten gelijk hebben om afstand te nemen van ranglijsten, in tegenstelling tot wat Sebastien Valkenberg in zijn recente column stelt:

fd.nl/opinie/15757...

FD stuk is paywalled, maar is ook beschikbaar via:

docs.google.com/document/d/1...
Waarom universiteiten gelijk hebben als ze afstand nemen van misleidende ranglijsten en focussen op echte kwaliteit
Internationale ranglijsten lijken objectief, maar meten vooral wat commercieel goed uitkomt. Ze zeggen weinig over de kwaliteit van onderwijs en onderzoek, schrijft Ludo Waltman, voorzitter van de nat...
fd.nl
November 1, 2025 at 3:02 PM
Very much looking forward to my participation in this webinar on Wednesday, together with four impressive colleagues: Anna Hatch, @rnls.bsky.social, @catmacos.bsky.social and @richardsever.bsky.social

@cwtsnl.bsky.social @metaror.bsky.social
TWO WEEKS TO GO: 'Preprints on the Rise: Trust, Trends, and What's Next', 5 November

Discover how preprints are reshaping scholarly communication, research integrity, and publishing in this forward-looking member-only webinar.

👉 buff.ly/QMMNC6B
November 2, 2025 at 9:02 PM
Reposted by Ludo Waltman
ICYMI: Read our impact story on policies at HHMI, Gates & Astera promoting #OpenAccess #OpenScience #OpenData. Thought leaders helping accelerate discovery in science @madubs.bsky.social @openaccessmaven.bsky.social @pracheeac.bsky.social! sparcopen.org/impact-story...
Funders Roll Out Next Gen Open Policies - SPARC
sparcopen.org
October 21, 2025 at 11:22 AM
In het Financieele Dagblad beargumenteer ik dat universiteiten gelijk hebben om afstand te nemen van ranglijsten, in tegenstelling tot wat Sebastien Valkenberg in zijn recente column stelt:

fd.nl/opinie/15757...

FD stuk is paywalled, maar is ook beschikbaar via:

docs.google.com/document/d/1...
Waarom universiteiten gelijk hebben als ze afstand nemen van misleidende ranglijsten en focussen op echte kwaliteit
Internationale ranglijsten lijken objectief, maar meten vooral wat commercieel goed uitkomt. Ze zeggen weinig over de kwaliteit van onderwijs en onderzoek, schrijft Ludo Waltman, voorzitter van de nat...
fd.nl
November 1, 2025 at 3:02 PM
Reposted by Ludo Waltman
1/2 📊 @cwtsnl.bsky.social published the 2025 release of its Leiden Ranking Open Edition: a real step toward open research information.
Built on OpenAlex, it:
• Uses transparent, reusable data
• Includes national & regional publishing (not only “core” journals)...
October 30, 2025 at 12:46 PM
Very proud of the improvements made by the Leiden Ranking team to the Open Edition of the ranking.

This demonstrates our commitment at CWTS to @barcelonadori.bsky.social and the open research information transition.

Great work by @neesjanvaneck.bsky.social and the rest of the team!
October 29, 2025 at 5:59 PM
Reposted by Ludo Waltman
25 years interactive open access publishing with transparent peer review. >50,000 peer-reviewed preprints + reviewer, editor, community comments in 19 journals @egu.eu. Thanks to @ludowaltman.bsky.social for his peer review report.
#openaccess #openpeerreview #preprints
doi.org/10.5194/acp-...
Review of interactive open-access publishing with community-based open peer review for improved scientific discourse and quality assurance
Abstract. Scientific discourse and quality assurance can be improved by open-access (OA) publishing with public peer review and community discussion. Over 25 years, the viability of this approach has ...
doi.org
October 28, 2025 at 9:17 AM
Reposted by Ludo Waltman
MetaROR, a platform for reviews of research on research, is a success! We have published 24 sets of reviews and have 16 submissions in process. MetaROR now has 9 partners - these are journals that agree to use our reviews when authors submit to them. metaror.org #metascience #openaccess
Home - MetaROR
MetaResearch Open Review MetaResearch Open Review MetaResearch Open Review A new platform designed to transform how we review and share metaresearch A new platform designed to transform
metaror.org
October 26, 2025 at 10:33 PM
Help OpenCitations address the most pressing needs of the community. Provide your input through the OpenCitations Community Survey!
OpenCitations grows thanks to its community, and now we’re asking for your input.
The OpenCitations Community Survey is your opportunity to share your perspective, suggest improvements, and guide our next steps.
Thank you!
👉 forms.cloud.microsoft/e/GYSZ230686
#OpenScience #Infrastructure
October 26, 2025 at 6:33 PM
Reposted by Ludo Waltman
💥New: Who should control open access, the markets or the commons?

✍️ @thomasgraves.bsky.social reviews Publishing Beyond the Market: Open Access, Care, and the Commons (@uofmpress.bsky.social) by @samuelmoore.org

#OpenAccess #OAWeek25 #ScholComms
Who should control open access, the markets or the commons? - Impact of Social Sciences
Publishing Beyond examines the ills of a marketised system of academic publishingand outlines how commons-based approaches could be an alternative.
blogs.lse.ac.uk
October 24, 2025 at 10:12 AM