This article presents the results of two case studies undertaken within the project MoKoM funded by the German Research Foundation (DFG). In this context, expert interviews were conducted in order to identify relevant competencies empirically concerning informatics comprehension and modelling. The interviews (N = 30) were based on typical scenarios of this domain and were conducted with different expert groups (experts of informatics, experts of didactics of informatics, expert informatics teachers). The goal of the interview analyses was to exemplarily examine the competence descriptions given by the different experts with regard to the categories of a theoretically derived competence model. The competence descriptions were also compared with reference to the different expert domains. Furthermore it was tried to identify recurring response patterns in the interviews with reference to the experts' background.