The public demand for open data, which many public and research institutions possess, is logically growing. Not only in the context of the coronavirus pandemic, but also with the increasing possibilities to process and visualise data from various databases of government and other organisations.
Open datasets have a very wide range of applications and uses, but there are also many pitfalls and limitations due to their nature or related legislation. Therefore, the theoretical part was devoted not only to the introduction to the issue as such, but also to the discussion of the extent and why to actually "open" the data. In practice, the participants then tried their hand at processing and visualizing selected datasets, especially with health topics such as cancer screening or psychiatric care. The data and its interpretation have a direct link and impact on health literacy. This is also why one of the supporting themes was the National Health Information Portal and its linkage to reports over available data. In the practical part, selected open datasets were thoroughly analysed and processed together with a detailed discussion.