This is the final report of an in-depth study of the use of paraprofessionals in the New York City public schools, conducted in the 1969-70 school year under an agreement with the Bureau of Educational Research of the Board of Education of the City of New York. The paraprofessionals studied were those funded with E.S.E.A. Title I and New York State Urban Education Quality Incentive Program funds and employed in "district decentralized" projects. The overall concept guiding the study was that paraprofessionals are certain kinds of people who perform certain tasks and have an impact on certain people around them. Out of this concept came the three tasks set for the study: to develop a profile of paraprofessionals giving background characteristics related to the purposes of the program and to the impacts paraprofessionals are intended to have; to survey the nature of paraprofessional work, determining what specific activities they carry out, in what kinds of schools, in what physical locations, and on what time schedule; and, to determine the impact paraprofessionals have on the paraprofessional himself, pupils, teachers, the school principal, and parents. (Author/JM)