To perform a complete and useful evaluation of the impact of federal funding, under Titles I, II, and IV of the Library Services and Construction Act (LSCA), on public library services to the disadvantaged, handicapped, and institutionalized, two convergent lines of study were undertaken: the study of project plans and achievements and the study of the needs of users and potential users. A comparison was made to determine the degree to which the projects satisfied the needs of the users. The study team examined the plans and actions of each state, queried all project directors, and conducted interviews with project personnel and with users and nonusers of the offered services. A determination of success and failure factors within projects contributed to the definition of a model program for service to special clienteles. It was concluded from the data gathered that the LSCA projects studied had been successful to some extent. More projects succeeded than not, and significant numbers of special clientele groups were reached. LSCA funds also proved to have been a critical factor in these projects and to have been a prime factor in innovation in public library services in the United States. The bulk of this report consists of data presented in tabular form. (SL)