This pretest report on the National Head Start Evaluation Project gives data on ethnicity and ages of children enrolled in four Head Start centers in Oklahoma, New Mexico, and Arizona, and describes the present status of evaluation at these centers. Completed pretests, proposed evaluation instruments, and available pretest data are presented. Appendices, which make up two-thirds of the report, give pretest distributions of scores on the Stanford Binet and distributions of chronological ages by location, ethnicity, and sex. (GO)