Although the discussion about feasibility in political theory is still in its infancy, some important progress has been made in the last years to advance our understanding. In this paper, we intend to make a contribution to this growing literature by investigating the proper place of feasibility considerations in political theory. A motivating force behind this study is a suspicion that many presumptions made about feasibility in several current debates—such as that between practice-independence and practice-dependence, ideal and non-ideal theory, and (...) political moralism and political realism—are too rigid and underestimate the numerous different ways in which feasibility concerns may enter into our theorizing. To chisel out this feasibility space, our aim is to suggest two metatheoretical constraints on normative political principles as intuitively plausible, the so-called ‘fitness constraint’ and the ‘functional constraint’, through which we elucidate five central aspects for determining proper feasibility constraints of an account in political theory. (shrink)