The purpose of this study was to develop a model based on both quantitative and qualitative data. The study focused on the role o f PSI in the BODYLOVE program’s influence on listeners’ physical activity. The entire study utilized a concurrent triangulation mixed methods design, conducting path analyses using structural equation modeling (SEM) techniques in the quantitative arm, and grounded theory in the qualitative arm. The data collection, and analyses were conducted separately, and simultaneously, and the two models resulting from each study arm were integrated into a composite model explaining the role o f PSI in BODYLOVE's effects on physical activity.