For 17 years, the Fort Worth Independent School District has offered full-day prekindergarten for educationally disadvantaged children residing in Chapter I attendance areas. During the 1984-85 academic year, the program was offered to 1,936 children who were four years old prior to September 1, 1984 and scored seven or fewer items correct on the Preschool Screening Evaluation (PSE). Most classes had 22 four-year-olds, one teacher, and one aide. In differentiated staffing, classes had two aides with one teacher, or two aides per classroom with one teacher supervising two or more classrooms. The curriculum focused on the development of skills in four areas: auditory, visual, motor, and language processes. Academic instruction was limited to approximately one hour per day and the rest of the school day was devoted to large group activities, outdoor activities, and creative activities in art and music. Instructional groups were small, consisting of no more than five or six children. Support services were provided by early childhood education specialists. Upon completion of the school year, children were given the PSE to test the 10 objectives of the program. The mean pretest score was four and the mean posttest score was nine, indicating students attained 90% of program objectives. (HOD)