THE PERRY PRESCHOOL PROJECT IS AN EXPERIMENT WITH REPLICATIONS DESIGNED TO ASSESS THE LONGITUDINAL EFFECTS OF A 2-YEAR, COGNITIVELY ORIENTED, COMPENSATORY EDUCATION PROGRAM. SELECTED FROM A POPULATION WHICH IS NEGRO, FUNCTIONALLY RETARDED, AND CULTURALLY DEPRIVED, CONTROL AND EXPERIMENTAL GROUPS ARE EQUATED FOR MEAN CULTURAL-DEPRIVATION RATING AND MEAN STANFORD-BINET IQ. THE EDUCATIONAL PROGRAM CONSISTS OF (1) DAILY MORNING CLASSROOM SESSIONS, (2) WEEKLY AFTERNOON HOME TUTORIAL SESSIONS DIRECTED TOWARD THE STIMULATION OF MATERNAL INVOLVEMENT IN THE EDUCATIVE PROCESS, AND (3) PARENTAL GROUP MEETINGS. CONCOMITANT EVALUATIVE RESEARCH CONSISTS OF THE ADMINISTRATION, AT ENTRANCE INTO THE PROGRAM AND YEARLY THEREAFTER INCLUDING LONGITUDINAL FOLLOW-UP THROUGH THE FIRST FEW YEARS OF SCHOOL, OF VARIOUS MEASURES INCLUDING (1) STANFORD-BINET, (2) LEITER INTERNATIONAL PERFORMANCE SCALE, (3) PEABODY PICTURE VOCABULARY TEST, AND (4) ILLINOIS TEST OF PSYCHOLINGUISTIC ABILITY. ALTHOUGH THE PROJECT IS IN PROGRESS, DATA ARE CURRENTLY AVAILABLE ON 4 WAVES OF PARTICIPANTS. THESE DATA REVEAL STATISTICALLY SIGNIFICANT DIFFERENCES BETWEEN CONTROL AND EXPERIMENTAL GROUPS WHICH TENTATIVELY ESTABLISH (1) THE VALUE OF THIS PROJECT AS A REMEDIAL PROGRAM AND (2) THE SUPERIORITY OF COGNITIVELY ORIENTED PROGRAMS IN CONTRAST TO TRADITIONAL NURSERY SCHOOL PROGRAMS. DETAILED RESEARCH STATISTICS ARE TABULARLY PRESENTED THROUGHOUT THE REPORT AND APPENDED MATERIAL INCLUDES ILLUSTRATIONS OF PROJECT SESSIONS AND PREVIOUSLY PUBLISHED REVIEWS AND ARTICLES CONCERNED WITH THE PROJECT. THIS DOCUMENT IS AVAILABLE FROM CAMPUS PUBLISHERS, 711 NORTH UNIVERSITY AVENUE, ANN ARBOR, MICHIGAN 48108. (JS)