In the period since multi-agency working became the dominant approach to tackling domestic abuse, there has been ongoing development and innovation. However, little is known about what tends to enhance or inhibit the roll-out of such initiatives. This article examines the process of building an enhanced flagship multi-agency model for policing domestic abuse. We report on results from semi-structured interviews, observations of meetings and an online survey with stakeholders who were involved in the development of the principles underlying a new multi-agency risk assessment conference (MARAC) process. The participants - representatives from policing, third sector, health, and probation organisations - described positive benefits of the process, whilst challenges coalesced around the focus on and engagement of perpetrators, and the problem of assessing the dynamics of risk.