The reference framework for those disciplines that deal with the functions of the nervous system has a very simple basic structure: It becomes clear when, based on the matrix with the four central questions of biological research (causation, ontogeny, adaptation, phylogeny), one asks and at the same time takes the reference levels (e.g. cell, organ, individual, group) at which the questions are aimed into account (the questions and planes in bold are also the subject of the humanities). This "bio-psycho-social" orientation framework is the basis for the development of an interdisciplinary consensus: It is the starting point for a systematic order for those disciplines, and also the basis for a consistent networking and structuring of their results.