Consultation to an outside agency is an important part of the work of departments of child and adolescent psychiatry. This article describes and illustrates one particular approach to such consultations based on the principles of structural family therapy. It is premised on the belief that outside agencies have the capacity to arrive at a decision which is in the best interest of their clients. To do this the agency needs to define what is the question they need an answer in order to make a decision regarding their client. The consultants' role is to clarify what decision the consultee agency needs to make by following up the question, What is the question you need to answer? How this question is followed up is discussed.