In 1970 the Los Angeles Superior Court ruled that the Los Angeles (California) Unified School District (LAUSD) operated segregated schools and it rendered the original order to integrate the district's schools. The School Readiness Language Development Program (SRDLP) is one of several programs developed in response to the original court order. Objectives of the SRDLP include oral language opportunities for 4-year-olds, a parent education component, a staff development component, and an evaluation component. This report presents information on student performance. Parent and teacher components are evaluated in Parts B and C. A review of data on the SRLDP indicates that the number of schools with the program has increased from 42 in 1979 to 305 schools (516 programs) in 1997-98. In 1997-98 the program served 15,480 students. Scores on the Student Profile Form, a measure developed to reflect SRLDP student performance, show that overall students are performing at 90% of the maximum possible total score. An analysis of this measure produced strong evidence of its reliability and validity. Comparisons of more than 7,500 former SRLDP students and non-SRLDP students in grade 4 supported the long-lasting impact of SRLDP. Former participants significantly outperformed nonparticipants in reading, language, and mathematics. When analysis of covariance was used to adjust for impact of intervening variables, such as gender, ethnicity, level of English-language proficiency, and family socioeconomic status, significant benefits were still apparent. The SRLDP has had a long lasting and positive effect on student achievement. Chapter 1 of this report focuses on student outcomes as measured by the student profile, and Chapter 2 compares the achievement of former SRLDP and non-SRLDP students. Appendixes contain the SRLDP reference guide, historical summaries in chart form, a list of participating schools, and the Student Profile instrument. (Contains 3 figures, 13 tables, and 9 references.) (SLD)