The thesis, ``Social development in the time of adolescence``, has a theoretic-empirical character. It deals with terms of adolescence, social development, emotionality, identity and socialization in the theoretical part. It also describes individual phases of adolescence, social and psychological features of adolescents. The thesis also gives brief information about characteristics of secondary schools. Practical part deals with questionnaires and personality tests which were fulfilled with the first, the second and the third year students of multi-year gymnasium. Illustration of attitudes to studies and relationship with oneself, authorities and with contemporaries are the main aims of the practical part. The survey deals with cognitive and emotional maturity and with the scale of significance of adolescents as well. It also should point out potential differences between evolution and maturity of boys and girls.