Within philosophy, the capability approach has been employed to the development of several conceptual and normative theories within, most prominently, development ethics, political philosophy, public health ethics, environmental ethics and climate justice, and philosophy of education. This proliferation of capability literature has led to questions concerning what kind of framework it is (section 1); how its core concepts should be defined (section 2); how it can be further specified for particular purposes (section 3); what is needed to develop the capability approach into an account of social justice (section 4); how it relates to non-Western philosophies (section 5); and how it can be and has been applied in practice (section 6). 