Student retention and transfer was studied at the University of California (UC) system as one aspect of undergraduate enrollment planning. A task group examined the following questions: (1) What is known about attrition? (2) When do students leave? (3) Who are the high-risk students? (4) Why do students leave? and (5) What is being done about it? Information is presented concerning the following areas: graduation rates for freshmen and for junior entrants, attrition rates for freshmen, junior entrants, and community college transfer students, attrition rates among ethnic groups, academic and social integration, financial aid and employment opportunities, and what students want to change in the university. The following university programs and services are addressed: summer programs, orientation, advising, curriculum changes, honors programs, additional on-campus housing and jobs, and planned leaves. The task group found selected instances of high and rising attrition at some campuses, for some ethnic groups, and for community transfer students who were ineligible from high school or who had low transfer grades. The university had initiated several activities to improve articulation and preparation and the campuses had begun several programs to improve the quality of student life and hopefully to improve retention. Recommendations pertain to efforts to improve articulation and preparation, university programs and services, and university administration. Appended materials include information on characteristics of UC campuses. (SW)