This course explores the theories and knowledge of bio-psycho-social human behavior within the reciprocal relationship of groups, organizations, communities and society. It provides the theoretical foundation for agency-based professional social work intervention with communities and organizations, including protective services, substance abuse, gerontological services and early childhood services. Systems theory serves as the organizing framework. This second course in the HBSE sequence continues to build students' understanding of how human behavior interacts with the social environment.