A Crucial Estimate Relived was written in 1964 by Sherman Kent, who as head of the Office of National Estimates was directly involved in an NIE that, in mid-September 1962, reasoned that the Soviets would not put offensive intercontinental ballistic missiles in Cuba. In less than a month, photographic intelligence proved the estimate wrong. In reflecting on the lessons learned, Kent discusses the estimative process in general as well as that erroneous estimate in particular.

The Primary Purpose of National Estimating was published in conjunction with the 50th anniversary of the Dec. 7, 1941 attack on Pearl Harbor and is a theoretical Estimate that might have been issued three days before the Japanese attack occurred.

Estimates and Influence was written by Sherman Kent. This classic of estimative intelligence, which treats both epistemology and its importance to the policymaker, was classified Confidential and published in the Summer 1968 by the Center for the Studies of Intelligence.