Although batterer intervention programs (BIPs) are often mandated for perpetrators of intimate partner violence, the precursors and mechanisms of change operating within these programs remain unclear. The purpose of this qualitative study was to examine the perceptions and experiences of participants in a diverse, group-based male BIP to better understand factors facilitating positive change. Data were gathered through individual interviews with 15 men and were analyzed using grounded theory. Findings suggest that change is taking place through a reciprocal process in which change occurring via the group context facilitates change within participants and vice versa. The specific benefits of the group context and value of group diversity were emphasized. Factors supporting this change process include the role of group facilitators and providing group members with access to ongoing support. These results are useful for informing the continued implementation and adaptation of BIPs with the goal of reducing and ultimately terminating abusive behaviors.