Exploration modules (EMs) and structures of knowledge as essential components of the author’s concept “Didactic system for object-oriented modelling (OOM)” for improving the OOM education are introduced as new learning aids for student-centered learning. The didactic criteria “Basic concepts on different abstraction levels” and “Synchronization, transformation and evaluation of views” for the design of EMs are developed. A methodology for designing a “didactic map” of object-oriented basic concepts as a process oriented learning aid is described. The activities of learners when using EMs with the solution of complex problems, e.g. modelling a library system, are illustrated. The strategy for inclusion in the Informatics teacher education is connected with some words on the concepts’ efficiency.