This manual is an introduction to the complex and multifaceted field of applied psychology, the relevance of the problems of which is becoming more and more obvious. Such an introduction is made on the basis of a systematization of various approaches to solving these problems from the methodological positions of differential psychology. In addition to general provisions, the manual separately discusses the issues of labor psychology of the head and social psychology of management, as well as the issues of psychology of management decisions that unite them. Specific proposals and recommendations for improving management activities are provided.