Abstract: From the ancient Greeks to the present day the psychological phenomenon of the will has been repeatedly subjected to philosophical reflection and research. As a rule, psychology views the term 'will' in terms of the activity environment, being defined as a regulator of the processes of activity. Having chosen the object of study volitional development of adolescents in educational activities, the author focused on the spiritual and moral conditions of such development. Special attention is also paid to the study of the structure and content, psychological mechanisms and external conditions of the volitional development of a teenager. The following methods were used: theoretical and methodological analysis of psychological and pedagogical literature, observation (diary), conversation, content analysis, analysis of the products of activities; Diagnostic methods “What is good, what is bad”, “How to act” (G. M. Freeman), questionnaire of value orientations (E. B. Fontalova), test questionnaire of developmental levels of personal will (I. I. Kuptsov, Yu. A. Eryomkin), expert assessment, self-assessment, psychological experiment on the volitional development of adolescents designed by the author; To analyze the data, mathematical-statistical methods were used (G-sign test and Fisher's angular transform method). A special contribution to the study of the problem posed by the author is that theoretically studied and concretized the meaning of the terms “volitional development”, “spiritual and moral conditions of volitional development”, “psychological and pedagogical conditions of volitional development”, and also developed the author’s methodology of volitional development in educational activities for teenagers and successfully tested.