The findings of an evaluation of the Chicago Public Schools 1984 Summer Basic Skills Centers program are presented. The program, which relied on the extensive use of youth tutors as well as trained teachers, was designed to extend participants' mastery of skills in the basic curricula of reading and mathematics. Participating students came from grades K-8. The evaluation confirmed that the program was effectively implemented and operated. Key findings were: (1) the staff development component was beneficial; (2) earlier preservice training for lead teachers, more intensive preservice training for lead teachers, and more intensive preservice training for classroom teachers and tutors were desired; (3) earlier assignment of tutors and more permissive screening of them are needed; (4) the quantity of materials to be covered in prescribed lessons should be reviewed to allow non-prescribed material to be incorporated; (5) materials and instructional levels of students should be better correlated; (6) the improved science component was popular among teacher and students; (7) the initial delivery of materials requires still better planning; (8) tutors' participation strengthened their grasp of the academic skills they used; (9) although students did not substantially increase their mastery of skills, results tended to be positive; (10) almost all teachers were enthusiastic about a special Limited English Proficiency program and recommended its continuation. (RDN)