Estimates of the numbers of developmentally disabled persons 21 years or older in New Jersey were derived to establish a potential target population for work activity programs. Chapter 2 presents estimates by county of the eligible State population of mentally retarded, cerebral palsied, and epileptic persons. (Figures represent 1970 Census reports, combined with prevalence rates for the respective groups from relevant scientific literature.) Chapter 3 introduces further calculations for each group, based on a statistical survey of an institutionalized developmentally disabled population. Estimates are presented in Chapter 4 for the eligible clientele for work activity in the 21 counties, while Chapter 5 consists of a statewide inventory of existing services by counties which was assembled from agency lists and telephone interviews. Adequacy of coverage and priority of need can be determined by comparison of the projected area populations with the inventory of existing services. Selection criteria are advanced in Chapter 6 concerning the location of work activity programs and centers, the approximate costs, and suggested guidelines for creating and expanding services. Estimated eligible population for adult work activity programs in New Jersey was 14,153; 1,761 adults were receiving work activity services in 1974. (Author/EA)