[About the systemic frame of psychotherapy].

Like in linguistic, one can distinguish two main fields of application of systemic family therapy: the structural field (or constitutive) and the semantic field. Both belong to the large systemic system (the word much less than ecological much greater than is closed to it). In a previous article, the author has studied the first field through linguistic, and in this article we deal mainly with the second field, with the help of text and context Bateson's as a leading mean. This fundamental relativistic perspective leads to such concepts as isomorfism and analogy, metascopy and metatheoretical attitude, aperceptive habits of thinking and learning frame, primary and secondary learning, paradox and double-blind. It finally leads to a systemic ethic and considerations about semiology and communication, institution and family, human history and adolescence, psychosis and psychotherapy (proceeding from a theoretical approach very different from classical scientific theory).