ABSTRACT
Logic is nothing but the method by which man always applies his knowledge, solves problems, reaches objectives, and logic is therefore the bridge between theory and practice. The interactional-systemic tradition has studied the logic of ambivalence in communication and has introduced the “double-bind” concept, at that time associated with the logical paradox, that is to say a message that conveys a content and its opposite. Most psychotherapeutic models move from theory to practice, forgetting along the way that between theorems and direct application stands a gap that can only be filled with a logic model. The phenomenon of paradoxical communication with one-self, with others, and with the world is the basis of the etiology of the most serious mental disorders and at the same time the structural basis of therapeutic interventions.
