This report examines the cost and benefits, both national security and economic, of export controls on certain high-technology, dual-use items including computers, microprocessors, commercial aircraft, and methodsfor data security. We also consider the nature and implications of U.S. unilateral export controls and sanctions, emphasizing the U.S. unilateral embargoes to certain proscribed states, the Enhanced Proliferation Control Initiative (EPCI), and u.s. mandatory sanctions policy under the Missile Technology Control Regime (MTCR). We analyze a few cases in detail rather than offer a generic, and inherently less thorough, review of all dualuse items. Assessments of the utility of high-technology controls cannot be made independently of a detailed analysis of the specific items and destinations subject to controls.