Policy analysis draws from a variety of disciplines and professions whose aims are descriptive, evaluative, and prescriptive. As an applied discipline policy analysis borrows not only from the social and behavioral sciences, but also from public administration, law, philosophy, ethics, and various branches of systems analysis and applied mathematics. The policy analyst may therefore be expected to produce information and plausible arguments about three kinds of questions: (1)values whose attainment is the main test of whether a problem has been resolved, (2)facts whose presence may limit or enhance the attainment of values, and (3) actions whose adoption may result in the attainment of values.