Formulation is a poorly defined, core clinical skill in psychiatry. The authors present a method of teaching and evaluating biopsychosocial formulation of cases and introduce a reliable formulation marking scheme for scoring the comprehensiveness of a formulation. This method has been well received by four successive groups of residents, does not involve excessive reading or esoteric terminology, can be used within the time constraints of clinical practice, is flexible, and can be used for any psychiatric patient.Abstract Teaser