In its general meaning, the term 'dialectic' refers to a struggle of opposites. Dialectical theory more specifically focuses on the universality of these opposites, i.e., each concept implies its opposite (i.e., good implies evil). Thus, gradual quantitative changes in a context of struggle may give rise to important qualitative changes. Within juvenile gangs, dialectic theory applies to the conflict between gang groups and individuals about when and how the gang should behave lawfully and unlawfully. The dynamics of this conflict are played out within the gang itself but may be influenced by such external forces as law enforcement, social work, and parental and community pressures. The attitudes of gang members are confronted by opposing attitudes within the group, so that the character of attitudes are penetrated and influenced by opposing attitudes to produce gradual change in gang life. If one dominant group theme is eventually replaced by another, a change of types has occurred. If the group which favors more law-abiding behavior replaces the group of dedicated delinquents, the entire gang may be said to have undergone a qualitative change. Even at this point, however, change continues under the minority influence of delinquent attitudes that produces conflict fueling change. 6-item bibliography.