This chapter explains four methodological principles implied by a problem-based approach to constructivism. First, the approach implies a principle of disunity where normative political analysis attends to issues emerging from distinct domains of interaction. Second, it implies a teleological justification whereby substantive political principles are justified as instruments for achieving certain ends. Third, it implies a principle of doctrinal bracketing whereby substantive justification brackets speculative metaphysical and epistemological claims. Fourth, it implies principled viability—the idea that substantive political principles are viable when they serve as standards that people can meet, standards that are demanded of them, and standards that guide their actions.