A strict interpretation of the doctrine of individual ministerial responsibility requires that the minister alone bear public responsibility for her department's actions. Critics charge that it is not sensible to hold a minister solely responsible for departmental errors when government departments are so large and complex, and senior bureaucrats so powerful in their own right; senior bureaucrats should be made directly accountable to Parliament. The paper uses a game theoretic model to show that this criticism is misguided. To the extent that politicians more effectively police the bureaucracy when they are governed by a doctrine of ministerial responsibility than when they are not, the doctrine strengthens accountability. Much of the doctrine's force comes from the threat of ministerial resignation, but the opportunities that the doctrine creates for opposition parties to embarrass the government also contribute to its efficacy.At the heart of Westminster parliamentary government is the constitutional doctrine of responsible government (Jones, 88; Sutherland). The doctrine has collective and individual aspects. The collective aspect of responsible government requires that ministers, as a group, bear responsibility for the policies and performance of their government. In practice this means that the government (i.e., the Ministry) must have the confidence of the House and that individual ministers must publicly support the Cabinet's decisions. Individual responsibility refers to the responsibility borne by a minister in his or her capacity as the political head of a government department. It is with individual responsibility that this paper is concerned.Individual responsibility requires that the minister be both accountable and responsible to Parliament for his or her department's activities (Woodhouse 1994, 27-39). The minister is accountable to Parliament in the sense that it is he or she to whom MPs put their questions and from whom they receive answers regarding the relevant department's policies and actions. In this capacity, the minister may simply be a conduit for information, or may be required to justify his or her department's position to Parliament. Responsibility goes beyond accountability; it requires that the minister not only explain his or her department's actions and policies but, in the event of a departmental error, accept the blame for the mistake and, if possible, correct