This publication presents four papers and comments that were delivered at a session of the annual meeting of the Western Economic Association on July 43, 1986 in San Francisco. The session was titled ?Measuring Structural Unemployment.? The papers have been revised-in some cases substantially-from the earlier versions that were distributed at the meeting. The papers reflect the interest of the U.S. Department of Labor, states governments, and private researchers in the issue of structural unemployment in the U.S. economy today. The papers represent research sponsored by three units o f the U.S. Department of Labor-the Unemployment Insurance Service, the National Commission-and a State employment security agency, the Nevada Employment Security Department.