The article analyses five necessary axiomatic criteria to build the didactics of a discipline. The axiom of the discipline didactics means both the presentation of the axiomatic criteria for defining and analysing and the presentation of the normative frame of the instructive activity projected and realized through discipline in accordance with each school stage. Then the article analyses the pedagogical principles. They represent those categorical imperatives having an axiomatic value, necessary in the projection of didactic or educative activities. They were identified in the model of the structure of education, being valuable in the concieving of the activities of teaching – learning - assessment actions. The principles become operational in any plan of projection if they were previously supported by the axiomatic theory.
Key words: the axiom of the discipline didactics, pedagogical principles