At Kingsborough Community College in Brooklyn, freshmen were placed in groups of up to 25 who took three classes together during their first semester: an English class, usually at the developmental level; an academic course, such as health or psychology; and a one-credit orientation course. The program also provided enhanced counseling and tutoring and a textbook voucher. Kingsborough's program is part of MDRC's Opening Doors demonstration, which is testing interventions at six community colleges designed to help low-income students stay in school and succeed. Opening Doors is the first large-scale study of community college programs to use a random assignment design of program evaluation. The report concludes that the jury is still out on whether learning communities improve students' persistence in school. The document includes five appendixes: (1) Supplementary Table for Sample Intake and Characteristics and Data Sources; (2) Survey Response Analysis; (3) Description of Scales Presented in Effects on Educational Outcomes; (4) Supplementary Tables for Effects on Educational Outcomes; and (5) Description of Scales Presented in Social, Psychological, and Health Outcomes. (Contains 5 figures and 25 tables. Individual chapters and appendixes contain footnotes.) [This document was written with: Jenny Au, Jedediah J. Teres, and Susan Yeh. Additional support for the dissemination of MDRC publications was provided by The Starr and Citi Foundations.]