This mixed-method retrospective and prospective study assessed whether age, education, employment status, emotional intelligence, and stage of behavior change were predictors of batter intervention program (BIP) completion. In-depth interviews were conducted to develop a better understanding of the attitudes, perceptions, and motivational characteristics for completing a BIP. It was hypothesized that a BIP enrollee’s age, education level, and employment status would predict BIP completion. Logistic regression determined that BIP enrollees 33 years of age or older were 1.2 times more likely to complete BIP. BIP enrollees with some college education were 2.4 times more likely to complete BIP. Finally, BIP enrollees who worked full-time were 1.7 times more likely to complete a BIP. Substantial amounts of data collected from the EQ-i instrument were invalid and could not be analyzed. However, data collected from the URICA-DV-R instrument showed a significant difference between the means of completers and non-completers, laying the groundwork for predicting behavior change. In-depth interviews revealed partners, mothers, children, facilitators, and jail were motivators to completing BIP, while money and slow judicial consequences were reinforcements to attrition. Discussion focuses on the limitations of the findings and recommendations for further research and practice.