According to the capability approach, ‘functionings’ and ‘capabilities’ are the best metric for most kinds of interpersonal evaluations. In other words, those interpersonal evaluations should be conceptualized in terms of people’s functioning and their capabilities. These beings and doings together are held to constitute what makes a life valuable. Whereas ‘functionings’ are the proposed conceptualization for interpersonal comparisons of (achieved) well-being, ‘capabilities’ are the conceptualization for interpersonal comparisons of the freedom to pursue well-being, which Sen calls “well-being freedom” (Sen 1992: 40).