Abstract: In 2019 the German Leibniz research organization sponsored a conference on Open Science (OS) with the idea to publish some of the presented papers in the Data Intelligence journal. Being aware of differences between policy level statements and data lab practices, we thought that it would be important for a special issue on OS to not just include papers from the conference, but to ask a few distinguished colleagues with different backgrounds to write a paper on their view on OS. The results are eight invited papers about OS and one paper describing data lab practices based on deep insights into about 70 research infrastructure projects. The contribution of Jean Claude Burgelman is special in this context since he was one of the key persons who solved the policy puzzle to get final agreements of all member states to make the European Open Science Cloud (EOSC) happen, which is an initiative for building an infrastructure to pave the way towards OS in Europe. This serious and fair description of complex political activities that created many frustrations but finally were successful is in our views a unique document worth elaborating on. Six experts who were involved in these processes arguing from highly different backgrounds and points of views responded with comments on this paper.
Keywords: Open Science; European Open Science Cloud (EOSC); Open by Design; Open by Publication