The purpose of this study was to provide a formative evaluation of the Parent Implementation Program (PIP), a certified expansion project of the Regional Intervention Program (RIP), a nationally recognized early intervention program in the state of Tennessee. PIP is implemented by parents to serve the needs of families in the Chula Vista community in San Diego struggling with young children with severe behavior challenges. The premise of this early interventional model is veteran program parents teach newer program parents positive behavior management techniques that they successfully learned in the program themselves. Professional staff members guide and supervise both “parent staff” and enrolled families as they progress through their behavior program, which entails two phases of treatment, active and payback. Once a family meets specified treatment objectives in the active phase, they transition to the payback treatment phase. The payback system enables veteran parents to generalize their newly acquired behavior management skills by teaching new families in the program. The evaluator employed a mixed-methods approach, incorporating both qualitative and quantitative data to evaluate PIP. This evaluation identified that PIP has a positive effect on diminishing unwanted behaviors in young children of those families that participate in the program. Key findings indicate that the program is implemented as intended based on the complete set of data. Parents experience less stress and see problem behavior as less intense and less of a problem after the program is complete. Both parents and staff attribute these diminishing behaviors to participating in the program.