Positive Peer Culture (PPC) is a strength-oriented approach developed by Vorrath and Brendtro (1985) to prevent or reverse negative peer influence by building a climate of peer concern and respect. PPC operates in a range of settings including residential treatment, alternative schools, juvenile justice, and youth leadership groups. It is an intervention that exemplifies positive psychology and positive youth psychology. From its inception, PPC was developed as a practice-based intervention. The evidence of systematic evaluations shows multiple positive effects on behavior, thinking, values, and self-esteem--as well as the development of a positive culture in the organization. Lessons learned from PPC compel one to rethink adult dominance and prescriptiveness in working with groups. This brings two important questions into focus. First, if the success of the helping process belongs to the youth, what are the touchstones for the professional performance? Second, if less is more, how should one style this new type of relationship between the adults and youth? The answers will be found in practice-based evidence: PPC presents the youth with many challenges, but adults will have to meet many challenges as well. (Contains 1 figure.)