Open Access


Open Access is based on the free and unhindered sharing and reusing of scientific literature and teaching materials. Open Access is stimulated by the use of open licenses such as Creative Commons.

There are different types of open access.

  • Green Open Access concerns materials that are located in the Repositories, this usually comprises author versions.
  • Gold Open Access concerns articles published by publishers with an open access publishing model. Hybrid comprises open articles, that have been paid for and which appear within closed journals. Involves
  • Diamond Open Access concerns materials that are published by universities themselves at no cost to the author.

The focus within open access is very much on scientific peer reviewed articles. In the coming years, the scope of open access will expand to books and book chapters.


For the TU Delft researchers, open access is the opportunity to share their work freely and unhindered to their peers within a legal construction, respecting the copyright laws. Every year more TU authors opt for publishing their work open access, while retaining the copyright.

TU Delft materials are increasingly quoted, translated  and reused worldwide through open access. It reinforces the position of a strong partner in scientific collaboration. And it should accelerate progress of science and the application of science to societal challenges.

What have we done so far

Open Access has a long history at TU Delft. On 10 May 2005 the TU Delft signed, as 61st of the now more than 600 scientific institutions, the 'Berlin Declaration' that states that Open Access is the best way to spread knowledge around the world as fairly as possible. Since 2003 the TU Delft Library has facilitated Open Access through the Institutional Repository. Additionally, an Open Access Fund that researchers can use to cover their APC costs (Article Processing Charge, paid to a publisher to make an article openly available) was created in 2008.

Since 2014, the focus has been on negotiations with publishers with the aim of changing the existing subscription models to a status where open access is dominant. This is done on a national scale under the leadership of the VSNU and at the local level where many agreements have been made. These agreements also concern publishers who have a 100% Open Access business model.

In order to strengthen OA, a TU Delft Open Access policy has been in effect since May 2016 This policy states that authors must at least publish their authors version in the TU Delft Repository.

Also, TU Delft output can be accessed via the national collection platform NARCIS (owner KNAW) which in turn is aggregated in the pan-European platform OpenAIRE.

TU Delft supports parties that play an important role in the promotion of open access and that don’t have a profit motive.

Every year, efforts in the area of open access are monitored. Both the totals and the variety of open access (Green, Gold and Hybrid) are important to consider. In the 2018 measurement, 62% of TU Delft’s peer-reviewed articles were published open access.

The Open Access plans for the future will be announced as part of the Strategic plan Open Science 2020-2024.