Specific Aim 2: Individual and group variation in effect sizes will be an outcome of youth behavior in the group (i.e., deviancy training) and group leader behavior management skill. We see youth behavior to be highly influenced by group leader management practices. We understand that some groups and/or individual children present challenges to even the most competent group leaders, and therefore, variation will be observable and meaningful. The design of the study allows for the testing of both group level and individual effects, and linkage of these effects to specific behaviors. Such information will provide an empirical basis for clinical training for group interventions with youth in general and Coping Power in particular.