This chapter examines the indicators used by U.S. President Jimmy Carter and two key decision makers in his administration, National Security Advisor Zbigniew Brzezinski and Secretary of State Cyrus Vance, to assess the intentions of the Soviet Union during the period 1977–1980. Using evidence from U.S. archives and interviews with former U.S. decision makers, it compares the predictions of the selective attention thesis, capabilities thesis, strategic military doctrine thesis, and behavior thesis. After discussing the U.S. decision makers’ stated beliefs about Soviet intentions, the chapter considers the reasoning they employed to justify their intentions assessments. It then describes the policies that individual decision makers advocated and those that the administration collectively adopted. It also explores whether decision makers advocated policies that were congruent with their stated beliefs about intentions and evaluate sthe impact of beliefs about intentions on U.S. foreign policy at the time.