Using the data from the Chicago Longitudinal Study (CLS), we are currently investigating the paths of effects of the Child-Parent Center Preschool Intervention on early adult well-being. Understanding the processes of long-term effects can help improve programs and promote the maintenance of effects. We investigate the processes of effects of the CPC preschool program for four domains of well-being (education, adult crime, health, and mental health) and using five established hypotheses (cognitive advantage, family support, social adjustment, motivation, and school support hypotheses) for main effects.