In the program "Motivation in Depth for Gifted High School Science Students" initiated in 1964, specially selected seventh grade students took in successive summers Biological Sciences Curriculum Study (BSCS), Chemical Education Materials Study, (CHEMS), and Physical Science Study Committee (PSSC) courses; a newly designed course, Laboratory Orientation and Instrumentation; and two academic years in the Laboratory Research Program. Evaluation was to determine program feasibility, collect selected data, and analyze differences between the experimental students and matched control students on the California Occupational Interest Inventory (COII). Feasibility was demonstrated by these observations: (1) 91.7 per cent of all class performances met school requirements; (2) participating students in BSCS and PSSC obtained scores on national tests more favorable than national controls; (3) participants performed satisfactorily compared with controls who took the regular academic program in tenth, eleventh and twelfth grades. Data have been collected over the duration of the program by the Wechsler Intelligence Scale for Children and specially constructed structured interviews, and by group Rorschach, Bell Personality Inventory and COII. Analysis of the COII revealed a significant increase in the difference between experimental and matched control students in the personal-social factor. (GR)