This report describes findings of a study concerned with identifying environments of support to increase the participation and success of African Americans, American Indians, Hispanics, and U.S.-born Asian Americans in doctoral programs. The project found that supportive environments include: (1) aggressive and targeted recruitment efforts; (2) substantial, multi-year fellowships and assistantships; (3) a locus of academic and social support services for minority graduate students; (4) an atmosphere of expected success; (5) departmental culture that supports faculty mentoring; (6) student support groups; (7) curricula which encompass diversity issues; and (8) a "critical mass" of minority students and faculty within individual departments. Preliminary information documents the extent of the problem and the study's approach. Six case studies describe programs at the following institutions: the Graduate School and University Center of the City University of New York; the University of Michigan; Brown University; the University of Texas at Austin; the University of Florida; and the University of California at Berkeley. Extensive appendices include: a list of persons interviewed for the study; a checklist for universities; suggested resources; tables listing minority Ph.D.s from 1979-89 at the top 50 universities, and doctorates awarded U.S. citizens by institution, major field, and ethnic group, 1979-89. (DB)