The Office of Special Education Programs funded Center to Inform Personnel Preparation Policy and Practice in Early Intervention and Preschool Education conducted a study to obtain current information about state certification requirements for early childhood special educators who work with preschool children with developmental delays and disabilities. Data were collected via Web searches and interviews. Part B 619 and other agency representatives provided information regarding the state's certification model, the rationale for developing that model, and certification content. Results indicated great variation in certification requirements across states and limited adherence to recommendations of professional associations.