 At the origin of any theory of capacity, there lies a set of paradigm examples around which the theory is built and which it must account for. Thus, in the initial instance, a theory is built around a selection of paradigm examples of what capacity and incapacity should be taken to be. The criticisms examined below all appeal to cases that the critics take to be obvious examples of incapacity, but which the four abilities model seems to classify as cases of capacity. Most theorists seem to agree that possessing the four abilities, at least to some degree, is necessary for capacity. The primary issue is about whether the four abilities are always sufficient or whether there are cases in which something else, some further abilities or some further feature of the subject’s choice, might be relevant to the assessment of capacity. The three elements most commonly cited by critics are (1) the subject’s emotions, (2) the subject’s values, and (3) the authenticity of a subject’s choice.