Seattle Social Development Project (SSDP). SSDP is a universal intervention for elementary school children with a school component and voluntary family component, developed to increase pro-social bonds, strengthen attachments to school, and decrease delinquency. The family component consists of parenting classes that cover family management (1st and 2nd grade), engagement in a child’s education (2nd and 3rd grade), and the drug abuse prevention program Preparing for the Drug Free Years (PDFY) (5th and 6th grade). In the school component, teachers are trained to establish clear rules and reward compliance, teach interactively, and promote cooperative learning in small groups. The goal is to increase the students’ academic performance as well as social skills and increase contact with pro-social peers. In addition, children are taught interpersonal problem-solving skills to improve communication, decision-making, negotiation, and conflict resolution. SSDP is the original intervention that serves as the basis for the Raising Healthy Children (RHC) intervention.