Understandings of administrative accountability in the " Westminster" democracies remain too closely linked to the institutional arrangements through which accountability has traditionally been exacted in these countries. This has prevented a full appreciation of the nature and extent of changes which have been under way for some time. The article argues that a refined concept of accountability and five subordinate "conceptions" of accountability, corresponding to distinctive sets of institutional arrangements, are needed to comprehend the relevant changes. The identification of multiple options for administrative accountability, in turn, raises questions about how the different accountability systems are to be chosen and combined to maximize accountability without impairing administrative effectiveness.The modern debate about administrative accountability in countries with Westminster-derived governmental arrangements' is centered on the heavy reliance of those systems on a single principle of accountabilitynamely, the responsibility of ministers of state to parliament -and concern about the continuing ability of that principle to ensure democratic control of a large, active and increasingly complex executive branch of government. A range of viewpoints on the nature of the problem can be found in the literature, but for present purposes two main camps can be identified. The first camp emphasizes the continuing relevance of ministerial responsibility and urges all players to recommit themselves to the principle (Butler 1973;Jones 1987;Sutherland 1991). Part of the problem, it is argued, is that critics of the doctrine have placed too much emphasis on its supposed requirement that ministers accept liability for actions performed on their authority, whereas the more realistic requirement of answerability and rectification is all that is often needed. The second camp, to which a majority of academic commentators probably now belongs, argues that ministerial responsibility either is now incapable by itself of sustaining a system of administrative accountability or else is undesirable in this role because of its adverse effects on efficiency or on openness and responsiveness in government (Robinson et al. 1987). and 108 Cowley Road, Oxford, 0x4, m, UK.