Alfred Adler's individual psychology is, alongside Sigmund Freud's psychoanalysis and C. G. Jung's analytical psychology, the third pillar of depth psychological theories. Individual psychological concepts have a firm place in psychotherapeutic treatment as well as in the counseling and leadership of people. Many of its fundamental terms, such as "inferiority complex," "self-esteem," "compensation," and "will to power," have become part of everyday language. The book provides an overview of the foundational principles of individual psychology and their application. A clinical case study illustrates the specific psychotherapeutic approach.