For patients experiencing psychosis, family work is an effective and important intervention and it is recognised that two co-workers are needed for interventions to be successful. While the co-working relationship is identified as an essential factor in the effectiveness of family work, there is less detail available about developing and maintaining the co-working partnership, and the work required to do so. This article examines the co-working partnership, and discusses how to choose a co-worker and develop the relationship. It also explains how the principles of co-working can be used in other areas, such as early intervention teams.