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Ludo Waltman

@LudoWaltman@social.cwts.nl
mastodon 4.7.3
  • Open on social.cwts.nl

Scientific Director and Professor of Quantitative Science Studies @cwts@social.cwts.nl, @universiteitleiden@mastodon.nl; Open Science Ambassador @universiteitleiden@mastodon.nl; Co-chair @RoRInstitute@indieweb.social; President @ASAPbio@mas.to; Editor-in-Chief MetaROR (MetaResearch Open Review); Former Editor-in-Chief @QSS_ISSI@scicomm.xyz

1169 Followers
394 Following
50 Posts
Joined December 07, 2022
ORCID:
https://orcid.org/0000-0001-8249-1752
Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 11mo ago

There is considerable discussion about the (lack of) openness of metadata of journal articles, but how do preprint servers perform in terms of openly available metadata?

@neesjanvaneck@social.cwts.nl and I report our findings in a new @leidenmadtrics@social.cwts.nl blog post https://doi.org/10.59350/te702-2ya75.

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 20mo ago

Earlier this week an opinion piece authored by me and a number of great colleagues was published on the @upstream@scicomm.xyz blog. Our piece introduces criteria for innovation-friendly bibliographic databases https://doi.org/10.54900/d3ck1-skq19.

We express our deep concerns about the treatment of @eLife@fediscience.org by the #WebOfScience and #Scopus databases. We see this as an example of databases hindering rather than supporting innovation in scholarly communication and research assessment.

@cwts@social.cwts.nl

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 8mo ago

Recognising and rewarding of open science in HR-policy

https://www.openscience.nl/en/recognising-and-rewarding-of-open-science-in-hr-policy

This post discusses the efforts Dutch research institutions are making to strengthen the way they recognize and reward open science.

I like in particular the 'Room for every PhD Candidate' initiative at @utrechtuniversity@akademienl.social.

This work is funded by @OpenScienceNL@akademienl.social and coordinated by @cwts@social.cwts.nl colleagues @AndreaRE_altibel@glammr.us and Inge van der Weijden.

openscience.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 22mo ago

The peer review system no longer works to guarantee academic rigour - a different approach is needed https://theconversation.com/the-peer-review-system-no-longer-works-to-guarantee-academic-rigour-a-different-approach-is-needed-244092

In this piece @stephenpinfield@mstdn.social, Kathy Zeiler and I make the case for the publish-review-curate model, the model we use in the #MetaROR (MetaResearch Open Review) platform launched earlier this week.

For more details about MetaROR's publish-review-curate model, see https://metaror.org/publish-review-curate/.

@RoRInstitute@indieweb.social @aimos@masto.ai @cwts@social.cwts.nl

theconversation.com
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 12mo ago

We need good practices for DOI registration for publish-review-curate platforms like @MetaROR@scicomm.xyz and others.

@andrebrasil@social.cwts.nl and I wrote a blog post about this: https://doi.org/10.64000/76jhx-x7s23

Together with @crossref@mastodon.online we hope to receive input from the broader community on this issue. If you have any thoughts on this, please share them with us!

Many thanks to @gin@scicomm.xyz at Crossref for extensive discussions on this issue and thoughtful feedback on the blog post.

@RoRInstitute@indieweb.social @aimos@masto.ai @cwts@social.cwts.nl

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 6mo ago

RE: @eLife@fediscience.org

eLife plays a leading role in promoting innovation in scholarly publishing. Innovation in publishing requires innovation in infrastructures and technologies.

Glad to see eLife received funding to continue its important work in this area!

fediscience.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 5mo ago
Replying to
@renebekkers@mastodon.social Excellent, Rene, I have very positive experiences with @prereview@mas.to. I use it a lot to publish reviews of preprinted articles. And I agree OSF and other preprint servers need to do a better job in linking preprints to reviews, for instance using COAR Notify. @coar_repositories@mastodon.social
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 5mo ago
Replying to
@renebekkers@mastodon.social I think @prereview@mas.to is indeed the best option for this. @MetaROR@scicomm.xyz is an option only if the authors of the preprint submit their work to MetaROR and MetaROR then invites you as a reviewer.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 8mo ago
Replying to
Many thanks to all colleagues who provided input in response to an earlier blog post published last year. This was extremely helpful! We have quoted some of you. @richardsever@mas.to @Samuelmoore@hcommons.social @hansdejonge@mastodon.online @Jeroenson@akademienl.social @MsPhelps@akademienl.social@eLife@fediscience.org @PeerCommunityIn@ecoevo.social
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 16mo ago

How does the adoption of preprinting differ between European countries?

Preprint adoption is significantly higher in Western and Northern European countries than in their Southern and Eastern European neighbors.

Switzerland has the highest preprint adoption in Europe.

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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago

A PhD in paper mills? https://retractionwatch.com/2025/05/01/phd-paper-mills-wiley-leiden-springer-nature/

This #RetractionWatch piece is about a PhD position we have at @cwts@social.cwts.nl for a project on paper mills.

For more info, see https://www.leidenmadtrics.nl/articles/advancing-our-understanding-of-systematic-manipulation-paper-mills-wiley-cwts-partnership.

Deadline for applying is May 13.

@stephenpinfield@mstdn.social @catmacOA@mastodon.scot

retractionwatch.com
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 13mo ago

The Data Infrastructure of the German Kompetenznetzwerk Bibliometrie: An Enabling Intermediary between Raw Data and Analysis https://doi.org/10.1162/qss.a.20

This paper provides a very helpful overview of the data infrastructure of the German Kompetenznetzwerk Bibliometrie.

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 20mo ago

How to flip your journal: A guide to more equitable publishing with #DiamondOA https://doi.org/10.5281/zenodo.14652446

Colleagues from several Dutch university libraries have prepared a guide on how to flip a journal to diamond open access. It includes a lot of highly valuable advice!

The guide also covers the flip of Elsevier's Journal of Informetrics to @QSS_ISSI@scicomm.xyz, a journal owned by the International Society for Scientometrics and Informetrics #ISSI and published by #MITPress.

social.cwts.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 23mo ago

Very much deserved, @annaveer@mastodon.social winner of the Leo Waaijers Open Science Award 2024!

@universiteitleiden@mastodon.nl

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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 7mo ago
Replying to
I very much enjoyed reading this article. The most important weakness is that the article doesn't acknowledge existing peer review approaches that separate evaluation of quality from evaluation of impact, such as the approaches of PLOS One and @eLife@fediscience.org. @richardsever@mas.to
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 7mo ago

RE: @BarcelonaDORI@mastodon.social

I am really excited about the coordinated developments in the Netherlands to implement the commitments in the Barcelona Declaration on Open Research Information.

Ana Ranitovic, chair of our national working group, has written a post summarizing the progress we are making in the Netherlands.

@cwts@social.cwts.nl @SURF@social.edu.nl

mastodon.social
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
Rather than trying to peer review each research output at a fixed point in time, the aim is to provide well-organized mechanisms for researchers to engage with each other’s work, enabling the value of research outputs to become clear over time as a result of a process of scholarly dialogue.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
Challenge of openness (2005-2025): This is the challenge of adopting open science practices such as open access publishing, preprinting, preregistration, open peer review, open data and open metadata. Over the past two decades, considerable progress has been made in addressing this challenge.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 8mo ago

RE: @FTM_nl@social.ftm.nl

Goed stuk over het wetenschappelijk publicatiesysteem.

Mijn voorstel is om het systeem op de schop te gooien: "niet eerst op journals wachten voordat zij de kwaliteit beoordelen, maar gelijk publiceren en vervolgens in alle openheid de peerreview doen"

https://www.ftm.nl/artikelen/wetenschappelijke-uitgeverijen-maken-melkkoe-van-gratis-toegang-tot-wetenschap?utm_source=bluesky&utm_medium=social&utm_campaign=GratisToegangWetenschap

#PublishReviewCurate

@cwts@social.cwts.nl

social.ftm.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 8mo ago

RE: @cwts@social.cwts.nl

Very proud of @Juan_P_Bascur@social.cwts.nl, who successfully defended his PhD thesis last week.

It was a great pleasure to supervise Juan's research!

social.cwts.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 24mo ago

Bezuiniging op Open Science NL, superzonde! https://www.leidenmadtrics.nl/articles/bezuiniging-op-open-science-nl-superzonde

In dit stukje leg ik uit waarom de halvering van het budget van @OpenScienceNL@akademienl.social zo zonde is. De open science transitie is essentieel om ons onderzoeksysteem in Nederland in te richten op een manier die aansluit bij de verwachtingen van de samenleving.

@cwts@social.cwts.nl @universiteitleiden@mastodon.nl

leidenmadtrics.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 22mo ago

The #MetaROR (MetaResearch Open Review) platform has been launched https://metaror.org/.

How does it work? More information about the MetaROR approach, including the publish-review-curate model used by the platform, is available at https://metaror.org/about-metaror/.

We also created a flowchart summarizing the MetaROR approach.

@RoRInstitute@indieweb.social @aimos@masto.ai @cwts@social.cwts.nl

social.cwts.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 23mo ago
Replying to
Using the publish-review-curate (#PRC) model, #MetaROR aims to make publishing and peer review faster, more efficient and more rewarding. See https://asapbio.org/understanding-the-publish-review-curate-prc-model-of-scholarly-communication for more information about the PRC model @ASAPbio@mas.to. Like @eLife@fediscience.org, MetaROR doesn't make binary accept/reject decisions. Instead, MetaROR provides editorial assessments of articles aimed at helping authors to improve their work and helping readers to develop a better understanding of the strengths and weaknesses of an article.
asapbio.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago

Journal of Data and Information Science (#JDIS) organizes special issue on 'Fostering SDG research through the lens of bibliometrics'. https://sciendo.com/article/10.2478/jdis-2025-0027

Special issue is organized in collaboration with @MetaROR@scicomm.xyz. Submissions will go through MetaROR's publish-review-curate process.

Exciting to see synergy between MetaROR's innovative publish-review-curate model and more established publishing model of #JDIS!

Special thanks to @andrebrasil@social.cwts.nl for organizing this.

@cwts@social.cwts.nl @RoRInstitute@indieweb.social @aimos@masto.ai

social.cwts.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
Challenge of meaningful dialogue (2025-…): This is the challenge of facilitating truly meaningful conversations between researchers. This requires abandoning the idea that all research outputs need to be peer reviewed.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
Growing interest in the publish-review-curate model illustrates this transition. It shows how dissemination of scientific knowledge can be accelerated, how peer review can be organized more efficiently and how curation can go beyond binary accept/reject decisions. @MetaROR@scicomm.xyz @eLife@fediscience.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
How to facilitate meaningful scholarly dialogue is a key challenge for the scientific publishing system going forward. Addressing this challenge needs to be accompanied by assessment reform, moving away from the current practice of giving special status to peer-reviewed outputs relative to other work.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 28mo ago

Towards the democratisation of open research information for scientometrics and science policy: the Campinas experience https://www.leidenmadtrics.nl/articles/towards-the-democratisation-of-open-research-information-for-scientometrics-and-science-policy-the-campinas-experience

Great blog post by Alysson Mazoni and @rodrigocostas@social.cwts.nl about opportunities and challenges in scaling up the use of open research information.

Also a great example of the value of our collaborations at @cwts@social.cwts.nl with colleagues in Brazil!

@leidenmadtrics@social.cwts.nl
@BarcelonaDORI@mastodon.social

leidenmadtrics.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
@Luke_Drury @hfalcke @stephenpinfield @cwts @RoRInstitute @ASAPbio Over 90%, that's really impressive, a great example for other fields!
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
@Luke_Drury @hfalcke @stephenpinfield @cwts @RoRInstitute @ASAPbio There are indeed major differences between fields in the physical sciences, with Astronomical and Space Sciences as well as Quantum Physics having the highest preprint adoption, followed by Atomic, Molecular, Nuclear, Particle and Plasma Physics. See the figure below for more details. Note: Field definitions are based on the Fields of Research (FoR) classification in #Dimensions.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
In ideal world, journals would ask authors whether their article has been preprinted. If it has, the journal article would link back to the preprint, both on the journal website and in the underlying metadata. I'd love to work on this with publishers!
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 18mo ago

Academic publishing is a multibillion-dollar industry. It’s not always good for science https://theconversation.com/academic-publishing-is-a-multibillion-dollar-industry-its-not-always-good-for-science-250056

"What could alternative academic publishing practices that safeguard the integrity of research look like? The 'publish-review-curate' model is one example. This model has been adopted by community research initiative @MetaROR@scicomm.xyz."

@LucyMontgomery_@toot.community @RoRInstitute@indieweb.social @aimos@masto.ai @cwts@social.cwts.nl

Academic publishing is a multibillion-dollar industry. It’s not always good for science
The Conversation

Academic publishing is a multibillion-dollar industry. It’s not always good for science

Some academic publishers have been accused by scientists of being “too greedy” and prioritising profit over research integrity.

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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 28mo ago

Very much looking forward to the Paris Conference on Open Research Information, organized on Sep 23-24 at Sorbonne University https://barcelona-declaration.org/conference/.

At this conference signatories and supporters of @BarcelonaDORI@mastodon.social will get together to develop a joint roadmap for implementing the commitments in the Barcelona Declaration.

Is your organization working on transitioning to open research information? Consider attending the conference to share your experiences and learn from those of others!

@cwts@social.cwts.nl

barcelona-declaration.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
Challenge of curation (2015-2035): This is the challenge of making best use of the limited capacity in the peer review system. The most important development is the transition from the traditional 'review, then publish' approach to 'publish, then review' approaches.
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Ludo Waltman @LudoWaltman@social.cwts.nl
· 23mo ago

The early days of peer review: five insights from historical reports https://doi.org/10.1038/d41586-024-03287-4

"The initial process was much more informal than the one scientists know today ... Some early referees’ reports have news about their holidays or what else they are doing"

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
Our bibliometric analysis combines data from #Dimensions, @OpenAlex and @crossref. Availability of reliable data on links between peer-reviewed outputs and preprints is limited. Our statistics provide a conservative estimate of preprint adoption. The actual adoption is somewhat higher.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
Our work shows there are still lots of opportunities for growth in preprinting. Math and physics demonstrate what can be achieved when preprinting becomes the norm. Other disciplines still need to make significant efforts to reach this point. Asia and Africa are lagging behind compared to many other regions, in particular North America and Western and Northern Europe. Lot of room for growth in preprinting in Asia and Africa.
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
There are lots of interesting additional analyses that can be performed based on our work. Unfortunately, we cannot share all data we used, but what can be shared is available in Zenodo https://doi.org/10.5281/zenodo.15301958 Hope it will be of use!
doi.org
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Ludo Waltman @LudoWaltman@social.cwts.nl
· 21mo ago

On the limits of causal theory for studying inequalities in science https://doi.org/10.1162/qss_c_00347

"This does not mean we should completely omit causal models ... they can help to disentangle concomitant mechanisms that are hard to study independently otherwise. At the same time construction of causal graphs can in many situations alert us from presence of statistical artifacts or colliders ... this is not a call for not using causal models, but a call for their responsible use"

@vtraag@social.cwts.nl @QSS_ISSI@scicomm.xyz

doi.org
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
Are you interested? Make sure to apply by May 13! This project will be supervised by Wolfgang Kaltenbrunner, @stephenpinfield@mstdn.social and myself. The project has been set up in an exciting partnership with #Wiley. https://www.leidenmadtrics.nl/articles/advancing-our-understanding-of-systematic-manipulation-paper-mills-wiley-cwts-partnership @leidenmadtrics@social.cwts.nl @catmacOA@mastodon.scot
leidenmadtrics.nl
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Open post
Ludo Waltman @LudoWaltman@social.cwts.nl
· 14mo ago
Replying to
@cwts@social.cwts.nl @RoRInstitute@indieweb.social @ASAPbio@mas.to @PeerCommunityIn@ecoevo.social @ReviewCommons@sciencemastodon.com @richardsever@mas.to @stephenpinfield@mstdn.social @kathleengregory@mastodon.social @andrebrasil@social.cwts.nl
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Ludo Waltman @LudoWaltman@social.cwts.nl
· 23mo ago
Replying to
Later this month #MetaROR will publish the first reviews and editorial assessments. Would you be interested to be among the first authors submitting their work to MetaROR? Feel free to reach out to me. Let's work together to improve our publishing and peer review practices in the field of metaresearch!
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Ludo Waltman @LudoWaltman@social.cwts.nl
· 17mo ago
Replying to
@Luke_Drury Interesting point, Luke, thanks!
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Ludo Waltman @LudoWaltman@social.cwts.nl
· 23mo ago

Metascience can transform Indian research https://blogs.lse.ac.uk/impactofsocialsciences/2024/11/08/metascience-can-transform-indian-research/

"stark misalignment in research priorities arises from focus on diseases like cancer and Alzheimer’s ... While cancers account for <5% of country’s disease burden, it is subject of nearly 22% of India’s health research publications"

This is partly due to these diseases being "more common in high-income countries, making them attractive research areas for Indian scholars seeking visibility in global journals"

@ismaelrafols@mstdn.social @cwts@social.cwts.nl

blogs.lse.ac.uk
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