This guide is intended to assist states and service delivery areas (SDAs) in addressing the new oversight responsibilities and opportunities stipulated by the Job Training Partnership Act (JTPA) with respect to implementing net impact evaluations. The following topics are covered in the individual chapters: the objectives and major provisions of JTPA and the importance of net impact studies to JTPA; the conceptual framework of a net impact evaluation (general research questions, participant outcomes and subgroups, and program activities and environmental conditions); research design (participant and comparison groups, selection of comparison groups, and sample sizes for participant and comparison samples); data collection and processing plans (selecting participant and comparison groups; obtaining preprogram data for each group; preparing a preprogram analysis file; and obtaining and processing JTPA program, outcome, and management information system data); data analysis plans (examining the adequacy of the comparison groups, estimating the average net impacts of JTPA programs, obtaining net impact estimates for various subgroups and by program length of stay, and adjusting for potential data and design deficiencies); cost analysis and benefit-cost comparisons; and relationships among the net impact, gross impact, and process analysis models. (MN)