The book is dedicated to the 100th anniversary of the birth of Evgeny Sergeevich Kuzmin, one of the founders of social psychology in the USSR. E. S. Kuzmin's contribution to science consists in developing the methodological principles of social psychology, determining its subject, laws and basic research methods. E. S. Kuzmin organized the first laboratory of social psychology in our country, created the first department of social psychology at Leningrad University. The works of E. S. Kuzmin have not lost their relevance, they give a comprehensive idea of ​ ​ the basics of social psychology.