It is fitting that one of the last major statements of International Relations theory in the 1990s should be a response to Kenneth Waltz's path-breaking book, Theory of International Politics. Unlike many other critically inclined scholars, Wendt believes that Waltz asked the right questions but supplied the wrong answers. Putting it simply, Waltz incorrectly conceptualized the structure of the international system. The first half of Wendt's book sets out to offer an alternative social theory of international politics to the ‘materialism’ and ‘individualism’ found in Waltz's work (specifically, chapters on ‘Scientific realism and social kinds’, ‘Ideas all the way down? On the constitution of power and interest’, and ‘Structure, agency, and culture’).