MADDSP identifies these children through a process known as active record review. In this process, records are reviewed every other year for children who are or will turn 8 years of age within the year of interest and live with a parent or guardian who is a resident of one of the five counties in which data are tracked by MADDSP. Trained abstractors review records and abstract detailed information at multiple health and education sources (such as clinics and schools) in metropolitan Atlanta that evaluate and provide services to children with developmental disabilities. The abstracted information from all sources for a given child is then reviewed by trained clinicians. These trained clinicians determine whether the child meets the criteria for one or more of the developmental disabilities that MADDSP tracks.