This paper describes the District of Columbia's system for tracking at-risk and disabled infants during their first 3 years of life. The project involves a computerized system for following the developmental progress of at-risk infants identified at birth or other times. The project monitors the activities of children within various service delivery agencies in the District. An introductory section addresses such infant intervention issues as risk factors, intervention strategies, program models, and home- or center-based programs. The District's Tracking System has four major components: case identification and registration; tracking; service linkages; and system evaluation. Case identification begins in the neonatal units of District hospitals. A registered nurse is assigned to serve as case manager. A record of the infant's conditions and other descriptive information is entered into the computer to begin the tracking process. Service agencies are "networked" together for monitoring infant progress and contacted twice yearly to identify infants receiving services but not yet in the Tracking System. The Tracking System is configured as a relational database management system and makes use of a Local Area Network approach. (19 references) (DB)