A Chapter 1 pre-kindergarten intervention summer school program of the Mesa Unified School District in Arizona was selected by the United States Department of Education as being unusually successful in meeting the special educational needs of disadvantaged children. Students determined to be at-risk are enrolled in the program, which takes place in June and July, and aims to help 4-year-olds acquire necessary language and pre-readiness skills to enter a formal kindergarten program. Classes, limited to 15 students, are offered at 7 regional sites. In addition to the readiness program taught by master teachers, two certified speech and language pathologists provide specialized services to students and in-service training to teachers. In the 1988-89 school year, 114 children were enrolled in the program. Of the students taking the Mesa Chapter 1 Pre-Kindergarten Progress Test, 92% attained 70% mastery, far surpassing the formal goal of 80% of the children attaining such mastery. Furthermore, while 100% of the students were initially eligible for remedial kindergarten programs in the fall, only 27% were so placed, while 73% progressed to a regular kindergarten. A seven-page project overview is provided. (Attachments contain a list of behavioral objectives, a treasure hunt language activity with charts and lesson plans, parent information sheets, the pre-kindergarten progress test, and forms and letters related to the program's award.) (SR)