Following an introduction by Betty J. Turock, nine reports examine key issues in library evaluation: (1) "Output Measures and the Evaluation Process" (Nancy A. Van House) describes measurement as a concept to be understood in the larger context of planning and evaluation; (2) "Adapting Output Measures to Program Evaluation" (Douglas L. Zweizig) presents 12 measures related to commonly occurring library objectives; (3) "Beyond Output Measures" (George D'Elia) proposes extending the evaluation process to include analysis of outcomes; (4) "Improving State Library Evaluation of Federal Programs" (Charles R. McClure) recommends ways for state library agencies to improve their evaluations; (5) "Evaluating the Impact of Federally Funded Public Library Youth Programs" (Mary K. Chelton) explores variables that hinder evaluation efforts; (6) "Qualitative and Quantitative Evaluation: Eight Models for Assessment" (Turock) identifies strengths and weaknesses of various evaluation methods; (7) "The Potential Role of Public Library Accreditation for Evaluating Federally Funded Library Programs" (Leigh Estabrook) provides background information about adapting accreditation to the public library; (8) "FSCS and the Evaluation of LSCA" (Mary Jo Lynch) defines current and possible future roles of the Federal-State Cooperative System; and (9) "The National Diffusion Network: Its Potential for Libraries" (Ellen Altman and Philip M. Clark) recommends ways of improving the evaluation designs of federally funded projects. (SD)