In the Phase IV portion of the Study of the Need for Educational Manpower for Handicapped Children and Youth, motivational factors affecting special education manpower supply and the impact of PL 85-926 on the supply were evaluated in two studies to which separate questionnaires were developed: the Personnel Motivation Study and the University Impact Study. The questionnaire concerning motivation factors causing people to enter, remain in, and leave special education was sent to personnel in the field, while the questionnaire concerning the effect of PL 85-926 funding on university special education programs was sent to universities offering programs for training personnel in the education of the handicapped. Results of the surveys demonstrated positive effects of PL 85-926 in all respects. It increased the capacity of universities receiving funds to supply manpower, and improved the quality as well as the quantity of graduating students. Attrition from the field was less among students receiving grants than among others. The relevancy of working with handicapped children, to personal and social values, attracted many students, but many had unrealistic images of time and energy commitment required or objected to training requirements for certification, pay, and working conditions. (EC 032 848-EC 032 852 contain related information.) (KW)