This is an evaluation of the Chicago, Illinois public schools' bilingual program during fiscal year 1979. The report states that bilingual instruction was offered in sixteen languages in more than two hundred programs ranging from pre-kindergarten to high school. Descriptions of both the elementary and high school language programs provide information on program structure, staff and student characteristics, and student development within the program as indicated by increased English instruction. Performance on standardized tests measuring mathematics and reading ability show student progress in the elementary grades. Grade point averages are used to demonstrate program effects on hiqh school student achievement. Results from classroom observation and teacher surveys are also presented. Significant findings offered by the evaluation include documented student achievement gains in English reading and mathematics and evidence that students are being moved into a regular English curriculum within three years. Appended to the report are a sample bilingual student form, a student census form, a classroom observation form, and a teacher questionnaire form. Also included are sample Spanish criterion-referenced tests in mathematics and an explanation of short tests of linguistic skills and their calibration. (APM)