This guide, which is based on a 12-month study that examined the feasibility of and procedures for evaluating federal, state, and local supported employment programs for individuals with severe disabilities, discusses recommended data items and measures and presents guidelines for developing a data collection strategy and implementation plan. Examined in the first part of the guide are measures for assessing the following aspects of supported employment programs: employment outcomes, quality of employment, worksite integration, ongoing support, quality of life, participant characteristics, systems change, and program costs. The basic building block required for analysis of most of these topics is the collection and recording of basic client-level data by supported employment projects around the country on program participants, services provided, and outcomes experienced by clients. The issue of consistency versus variation as it applies to developing a data collection strategy and implementation plan is discussed. The questions of who collects data, maintains a client-level database, aggregates the data and generates summary reporting measures, and analyzes the data are addressed. Also covered are timing issues and perspectives on project and state accountability. An appendix contains the current Office of Special Education and Rehabilitation Services definition of supported employment. (MN)