As part of the Career Planning Program (CPP) introduced in 1971 by the American College Testing Program, the program component, CPP 8-11, emphasizes career exploration. The document describes the program, its uses, and its development, and summarizes related research. Following the program rationale, Part 2 discusses (1) assessment components measuring interests, abilities, and career-related experiences and (2) career guidance components directed toward career planning and their administration and scoring. Part 3 discusses CPP 8-11 uses in career guidance programs, facilitating self-awareness via score profiles, and offers suggested units and resources for a career planning mini-course. The descriptions of each assessment component, the research on their measurement properties, and comparisons with CPP 12-13 are found in Part 4. References are listed, and data from studies are extensively displayed in tabular and graphic form. The appendix provides resources for the mini-course, a guide for increasing student career development with suggested resources and activities, a guide to developing and using a Career Information File organized around job families of CPP 8-11, job families related to course areas, job families from CPP 8-11 related to the U.S.O.E. career clusters, tables indicating the norms of the CPP 8-11 assessment components, and transparency masters. (JB)