The Model: For their model the authors used the six core competencies: (a) patient care, (b) medical knowledge, (c) practice based learning and improvement, (d) system based practice, (e) interpersonal and communication skills, (f) professionalism, as outlined by the Accreditation Council for Graduate Medical Education (ACGME) and some specific ‘skills sets’.2 With a Venn diagram of three sets they illustrated how the core competencies and the skills of their model are interrelated. A Venn diagram represents all possible logical relations between a finite collection of setseven a ‘metaphorical Venn diagram’ should follow this rule. The challenge to represent six core competencies with three sets is partly solved by combining competencies (a) and (b) in one set: these competencies characterize what a medical practitioner does. It fails for competencies (e) and (f) since these are no subsets of the other core competencies, but core competencies of their own. We would highly recommend to utilize a higher order Venn diagram.3