The Open Science Lab bundles expertise on Open Science at CWTS and contributes to and studies the transition towards Open Science at CWTS, Leiden University, and beyond. It serves as a knowledge broker, facilitator, and platform for learning and exchange.

Leiden University has an Open Access policy and a Copyright Information Office.

Leiden University has an Open Access policy and a Copyright Information Office.

Leiden University policy requires researchers to make all their Leiden-affiliated peer-reviewed articles available.

OSCL is a learning community where anyone associated with Leiden University can learn and talk about open science practices. Example events are Open Science cafés, workshops, and walk-in-hours. The what Open science is an umbrella term for an approach to science that aims to make scientific…

Want to study abroad? Visit the Master’s Week of Leiden University and find which master's programme taught in Leiden or The Hague is right for you.

The opening of the Academic Year 2025-2026 took place on Monday 1 September 2025 in the Pieterskerk church.

Study information

The opening times of the Humanities buildings vary. The Lipsius building is opened during evenings as well, the other faculty buildings retain office hours.

The Dutch Open Government Act (Wet open overheid (Woo)) has been in effect for several months now. Yet various government authorities were in the news recently due to violations of the right to information. Newspaper Trouw investigated whether political unwillingness is on the rise.

De overheid moet in een democratie openbaarheid nastreven, maar soms is geheimhouding noodzakelijk om belangen als veiligheid of privacy te beschermen. De Wet open overheid (WOO) bevat daarom een recht op overheidsinformatie, maar staat ook uitzonderingen daarop toe om in de wet gespecificeerde belangen…

It is advisable to open Dutch bank account once you move to The Hague (if you do not have one already), as it will allow you to get many other services such as a mobile phone contract, transportation, etc.

Techreuzen strijken de winst op en gemeenten en de overheid zitten met maatschappelijke en financiële lasten. In Binnenlands Bestuur, luidt Reijer Passchier, hoogleraar Digitalisering en de democratische rechtsstaat aan de OU en universitair docent Staatsrecht de noodklok over deze disbalans.

Veel overheidsorganisaties hebben nog te weinig kennis van de Wet open overheid (Woo), ‘wat zorgt voor frustratie bij verzoekers en onzekerheid bij derden’, zegt Annemarie Drahmann, universitair hoofddocent Bestuursrecht en Woo-expert in iBestuur.

Positive expectations can influence sensations of itch and evoke placebo effects, whereas negative expectations can trigger nocebo effects in itch. There is evidence that placebo effects can occur even when people know that they are taking a placebo. Little is known about how these so-called open-label…

In 2023, the OSCL, together with the University Library and Academia in Motion, ran a survey to better understand the state of Open Science at our university. In this year's follow-up, we are asking you to give your input, so we can jointly develop how Open Science evolves in our university.

Over the next two years, CWTS and Dialogic will develop a robust and context-specific monitoring and evaluation framework for Open Science in the Netherlands. This will be accompanied by the development of a prototype dashboard to showcase how such an Open Science monitor could be made visible.

We develop open micro cavities to trap light in small volumes and thereby increase the interaction with intra-cavity emitters. Important aspects in this development are the optical penetration in the mirrors, coupling between optical modes, and scattering and clipping losses.

On this page you'll find the recordings of the programme presentations held at the Leiden University Bachelor's Online Open Day of 7 October 2023. Perhaps you joined this event and would like to rewatch the presentations or are curious about ones you didn’t see the first time around. Or you haven't…

Lots of efforts are being made to promote open science practices in scholarly publishing. However, information on the openness of scholarly journals is highly fragmented. There are various data sources that provide information on specific aspects of openness, but there is hardly any integration of these…

In July 2022, Leiden hosted the ESOF conference.

The Netherlands aims to have open and responsive government. As part of the ‘Actieplan Open Overheid’, Ymre Schuurmans, Annemarie Drahmann and Louis Honée from the Department of Constitutional and Administrative Law are researching how citizens' information position in administrative law proceedings…

How does open government affect the level of public trust?

A Humanities degree gives you a solid start on the job market. Here you can find up-to-date information about Humanities graduates on the job market, as well as alumni stories.

In 'That's Why Teacher', our educators share their experiences. Asking challenging questions to seek a deeper understanding is how Stella Trompet perceives the growth of her students. She serves as a lecturer in the half-minor and master's programme Health, Ageing, and Society at LUMC/Leiden Univers…

Join the OSCL community to share your experience and learn more from others at Leiden University

Combining results from bibliometric analyses, a global sample of researcher opinions and case-study interviews, a new report reveals that although the benefits of open research data are well known, in practice, confusion remains within the researcher community around when and how to share research…

Promotores: Prof.dr. B.R. Katzy, Prof.dr. K. Sailer (Munich University)

The opening of the Academic Year 2019-2020 took place on Monday 2 September 2019 in Pieterskerk church.

The opening of the Academic Year 2024-2025 took place on Monday 2 September 2024 in the Pieterskerk church.

De opening of the Academic Year 2021-2022 took place on Monday 6 September 2021 in Pieterskerk church.

De opening of the Academic Year 2022-2023 took place on Monday 5 September 2022 in Pieterskerk church.

De opening of the Academic Year 2023-2024 took place on Monday 4 September 2023 in Pieterskerk church.

Leiden University offers support in the different stages of your research lifecycle.

Find out all about our bachelor's programmes and studying at Leiden University at the Bachelor's Open Day on Saturday 7 March 2026 in Leiden and The Hague. There will be live talk shows about the bachelor programmes, campus tours and information markets where you can find out more about our programmes.…

Find out all about our bachelor's programmes and studying at Leiden University at the Bachelor's Open Day on Saturday 7 March 2026 in Leiden and The Hague. There will be live talk shows about the bachelor programmes, campus tours and information markets where you can find out more about our programmes.…