Critical thinking is internationally recognized as an important aspect of school education. Particularly in the United States, Scandinavian, and Asian countries, critical thinking is firmly anchored in school curricula. In this context, critical thinking is often aligned with critical thinking skills, which can be taught in structured programs and are comparable to strategies for self-regulated learning. Unlike in the United States, in German-speaking countries, critical thinking is a buzzword in pedagogical debates and is not firmly embedded in instructional contexts. There are desiderata for the entire educational system (theoretical, empirical, and school-practical). In the context of gifted education, development projects place a particular focus on the possibilities of design and investigation. Two projects will be presented, as well as exemplary implementation possibilities relevant to schools' diagnostic and didactic processes. The projects will be related to each other, and research perspectives are given.