This study gathered information on the certification, licensure, and/or credentialing processes of professional disciplines involved in service delivery to infants, toddlers, and preschool children with special needs, as legislated by Parts H and Part B of Public Law 99-457. The 10 disciplines targeted in the national survey were special education, physical therapy, occupational therapy, speech pathology, audiology, nursing, medicine, nutrition, psychology, and social work. Data collected from Part H state coordinators (N=49) indicate that most states have standards for a majority of the disciplines, but many states are using personnel standards which regulate services to a broader age range than 0 to 3 years, or 3 to 5 years. Data also suggest that there exists a lack of trained personnel available to implement early intervention services. Most licensure/certification is based on coursework as opposed to competencies. Several actions are recommended to develop a comprehensive system of personnel development and the development of standards specific to the 0 to 3 population. A list of state regulatory agencies for each of the 10 disciplines is appended. (Contains 14 references.) (JDD)