The Cluster Concept Program in vocational education, a program for the 11th and 12th grades, is designed to prepare youth for entry level capability in a variety of related occupations rather than a specific occupation. Phase III of research with the program was the evaluation of the first year of experimentation with the programs for the 11th grade. A pretest-post test research design with four control and four experimental construction cluster groups, four control and three experimental metal fabrication cluster groups, and three control and three experimental electromechanical cluster groups was used to estimate the program effectiveness. Newly developed measurement instruments and standardized tests were used to estimate changes in selected cognitive, affective, and psychomotor behaviors. Objectives were attained in varying degrees with significant gains in cognitive abilities in eight experimental groups and modest gains in two groups. Increased flexibility of occupational preferences and broadened interests were found in the experimental groups. Inadequacies identified from the evaluation will serve to establish a list of realistic recommendations for the further development of the programs. The appendixes contain measurement instruments and achievement tests used in program evaluation. Related documents are VT 002 356, VT 002 254, and VT 004 162-VT 004 165. (HC)