This manual systematically and comprehensively presents the existing knowledge on supervision and organizational consulting. The contributions come from key representatives of various approaches from Germany, Switzerland, the USA, and Canada. It is aimed at all professionals in the psychosocial or industrial fields of supervision and consulting who work with individuals, leaders, groups, teams, projects, and systems or organizations, and who wish to acquire the necessary historical, anthropological, psychodynamic, and methodological foundations, regardless of whether they are in training or have years of experience.