The spatial aspect of identity and culture is addressed in this paper. Identity and culture are different concepts, connected by the term interaction. The objectivistic concept of culture s an effect of interaction while the subjectivistic concept of identity is a kind of intended interaction. Formal quantitative analysis can be used to investigate culture while the investigation of identity is limited by certain restrictions. A degree of correspondence between culture and identity and additional assumptions are used to overcome a part of these restrictions.T hen, the quantitative method is introduced, which is illustrated by case studies from South-West Germany. In addition two complementary concepts are discussed. This paper pleads for the integrative paradigm, which uses complementary approaches.