"How do leaders perceive threat levels in world politics, and what effects do those perceptions have on policy choices? Mark L. Haas focuses on how ideology shapes perception. He does not delineate the content of particular ideologies, but rather the degree of difference among them. Degree of ideological difference is, he believes, the crucial factor as leaders decide which nations threaten and which bolster their state's security and their own domestic power. These threat perceptions will in turn impel leaders to make particular foreign-policy choices."--Jacket.