This brief, the first in a series exploring key issues of program quality and best practices within prevention programs for pregnant women and children from birth to 3 years of age, focuses on ways to incorporate developmental screening into programs and services for young children. The brief defines developmental screening and discusses its role as a key preventive service for all young children. Also described are considerations for setting up a developmental screening process in different types of programs, services, and settings. Key best practice elements for developmental screening are presented, related to screening frequency, the screening instrument, follow-up, and parent involvement. The brief also offers tips for working with parents in the screening process and provides information on commonly used developmental screening tools, including the Ages and Stages Questionnaires, the Battelle Developmental Inventory Screening Test, the Denver II Developmental Screening Test, and the Parents' Evaluation of Developmental Status. Finally, the brief lists additional organizational and Internet resources for information on developmental screening. (KB)