This paper describes state of mind assessments as undertaken by child psychotherapists. It considers the similarities and differences with an assessment for an ongoing child psychotherapy treatment intervention and is described here as a ‘package’ that is offered to the family, child and young person and also the referring colleague. It is suggested that the consultative aspect has more weight in a state of mind assessment. The stages of the assessment are outlined and include the initial consultation with the referring colleague, a meeting with parents, three sessions with a child or young person and feeding back to parents with further consultation to the referring colleague. The meaning of the request at any particular time is explored and influences the stance and the approach to the assessment by the therapist. A summary of a case example illustrates the different stages outlined here. The thinking and approach described may be particularly useful to trainees and those starting out as child psychotherapists in child and adolescent mental health services.