This report responds to the California Legislature's request for an assessment of the impact of intersegmental programs designed to enhance student preparation for college, particularly those students historically underrepresented in postsecondary education. The report focuses on the effectiveness of each program and its components and the extent to which these programs function in an integrated and coordinated manner. Analysis of reports submitted by nine intersegmental student preparation programs resulted in the following conclusions, among others: (1) program efficacy has been demonstrated; (2) resources have been spent efficiently; (3) ample knowledge exists as to the strategies and activities that lead to enhanced student preparation for college; (4) these programs should be expanded; and (5) educational equity goals require enhancement of all schools' capacities to educate children. Individual chapters address the conclusions and recommendations, the study background, program characteristics, program effectiveness, and effective program components. Extensive appendixes include information on participation by California schools in intersegmental student preparation programs and information on the following programs: Alliance for Collaborative Change in Education in School Systems; California Academic Partnership Program; California Student Opportunity and Access Program; College Admissions Test Preparation Program and University and College Opportunities Program; College Readiness Program; Early Academic Outreach Program; Mathematics, Engineering, Science Achievement; and Middle College. (DB)