In this book I would like to present an approach to psychological expertise in the judicial environment when the judge calls on a psychologist to enlighten him on the personality of the defendant.The psychologist''s work must be well structured rather than going off in all directions and presenting himself as a charlatan who doesn''t know where to start in order to enlighten the justice system which calls on the services of a psychologist. Each person has a cycle of self-realization unlike Maslow whose pyramid I demonstrated at length in my work. Each person has a cycle of self-realization as in the case of a defendant who has committed a legally reprehensible act.The fundamental question for justice is: what was the mental structure at the time of committing the act? And how does this structure relate to the act? To provide effective answers we need a working methodology which is what I propose in this book.