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In his usual direct way, John J. Mearsheimer has sharpened the theoretical issues dividing realist from institutionalist theory, and for this service we are grateful. We are also pleased that he has read the institutionalist literature so thoroughly He correctly asserts that liberal institutionalists treat states as rational egoists operating in a world in which agreements cannot be hierarchically enforced, and that institutionalists only expect interstate cooperation to occur if states have significant common interests. Hence institutionalist heory does not espouse the Wilsonian concept of collective security-which Charles and Clifford Kupchan refer to as ideal collective security-critiqued so well by I.L. Claude thirty years ago.1 Nor does institutionalism embrace the aspirations to transform international relations put forward by some critical theorists. Like realism, institutionalist theory is utilitarian and rationalistic.2 However, Professor Mearsheimer's version of realism has some rather serious flaws. Among them are its penchant for assertions that turn out to be incorrect; its propensity to privilege its own viewpoint, so that in the absence of decisive evidence either way it invariably seems to prevail; its failure to explicate the conditions for the operation of its generalizations; and its logical contradictions, escaped only through verbal sleight-of-hand. We will begin by pointing out such errors from his own recent articles in this journal, then