This report describes personnel development issues relating to the involvement of occupational therapists, physical therapists, and speech-language pathologists in implementing Part H of Public Law 99-457, which calls for early intervention services for infants and toddlers with disabilities and their families. To determine personnel needs for implementation of Part H, this study reviewed workforce studies, labor statistics, and data about preservice allied health training programs. The study found that shortages projected for the year 2000 equal about 50 percent of existing occupational therapists, over 200 percent of existing certified occupational therapy assistants, 87 percent of existing physical therapists, and 40 percent of existing speech-language pathologists. Reasons for the severe shortages include: (1) population trends have increased the demand for these services; and (2) the number of new professionals entering these fields has been reduced. Additional information needed to effectively plan for early intervention services is discussed. Strategies are offered for dealing with the anticipated shortages of allied health personnel, including contracting, increasing personnel supply, developing new service delivery models, redefining who should receive services, and delivering holistic developmental services. (Contains approximately 30 references.) (JDD)