Open Access provides researchers another opportunity of publishing, besides the traditional publication in subscription-based journals. Providing higher dissemination and therefore visibility as well as better accessibility, among others, Open Access helps to fulfil changed needs of authors and readers in our information and communication society of today. Though this publication model provides a lot of advantages both for readers and authors, there are also some obstacles. In order to identify the incentives that can lead scientists of medical informatics to an Open-Access-publication, we conducted a study consisting of group discussions, interviews, and surveys. This tripartite evaluation starts in its first part with group discussions and interviews. First results of them show that, among others, the higher visibility, indexing, Impact Factor and better accessibility are factors for an Open-Access-publication.