Accountability has become a cornerstone of current discussion on the prospects of legitimate and effective global governance. In spite of its rather high currency, accountability does not partake in the select group of first-order political ideals: democracy, human rights, constitutionalism and rule of law have all been historically uttered in much more vocal tones and still remain at the forefront of public demands for legitimate authority. Rather than radiating a comprehensive legal or political vision, accountability supplies a power-constraining toolbox that allows for a variety of more or less attractive permutations. This rather commonplace story, though, tells very little about the concrete configurations, underlying values and ends of accountability. The concept of accountability remains unstable because, among other things, its descriptive and normative aspects lack a clearer articulation; traditional taxonomies fail to precisely illuminate its political and extra-political instantiations, and their respective connection with law; the relevant descriptive variables that shape accountability arrangements are not yet systematized in a comprehensive way; the specific normative goals that lurk behind the calls for more accountability tend to be taken for granted, and the trade-offs or internal tensions that necessarily occur are usually camouflaged. Conceptual clarification, thus, is indispensable whenever one comes across such multifaceted umbrella terms. The article attempts to diagnose such shortcomings, to elucidate a minimalist concept of accountability and to provide a large analytical map that can aid both the description and the critical assessment of accountability arrangements in light of their potential purposes. This analytical exercise is a pivotal starting point if accountability is to get a better grip on the debates about the improvement of global governance.