A transparent research process is trustworthy and enables progress. That is why Open Data is an important topic in research and is required by more and more funders. The goal is to allow others to use, review and reuse scientific findings. For this purpose, the data should not only be open but also fulfil certain quality criteria.
According to the FAIR principles data should be findable, accessible, interoperable and reusable to maximise its reuse potential.
See the SNSF's list of FAIR repositories
(Meta)Data are accessible online, unless they are subject to data protection, copyright or other legal restrictions (e.g. special contracts). Access to the data is clearly described (e.g. embargoed, closed, restricted, open access). If the data itself cannot be shared, at least the metadata is available.
To ensure that (meta)data are compatible with different computer systems, open formats are used. The metadata reflect the standards of the respective research discipline. Persistent identifiers can be used to link data with its publication, authors, code and other related information.
The metadata clearly specify (e.g. with a license) under which conditions the data can be reused.