People turn to a psychotherapist for various complaints. They often struggle to describe their issues precisely at the beginning of therapy and have specific expectations regarding desired changes or solutions to their problems. Functional behavioral and problem analysis is an important diagnostic procedure in behavior therapy. It is a prerequisite for selecting appropriate clinical-psychological interventions. This volume provides information on the fundamentals of behavioral diagnostics and describes a practical approach to behavioral analysis. The goal of behavioral analysis is to capture a person's reactions in different situations on various levels. The aim is to determine the conditions under which a behavior was acquired.