A program providing inservice training for preschool personnel (day care or Head Start directors and teachers) in early identification and intervention procedures is described, and two related research studies are cited. In the first, 423 Denver Developmental Screening Tests from 16 preschool centers were analyzed, indicating that approximately one in 10 children were potentially at risk for developmental problems, and that nearly 2% were showing some developmental disturbances (language and fine motor adaptive). The second study examined the attitudes of 72 preschool personnel toward mainstreaming. Findings did not reveal a joint contribution of employment and participation status toward attitudes to mainstreaming. Directors and special education teachers had more favorable attitudes toward mainstreaming than did regular teachers. The inservice program focused on six elements basic to diagnostic-prescriptive teaching: assessment, goal setting, strategy selection, individualization, application, and evaluation. (CL)