This guide is intended for professionals, laypersons, funding agents and others involved in planning and delivering local prevention services. Chapter 1 defines prevention, and differentiates between prevention strategies and programs targeted toward individuals or to general populations. Program evaluation and evaluation research are defined and basic concepts of program evaluation are identified. In chapter 2 specific uses of prevention program evalation are described and related to the concerns of those requesting the evaluation. Chapter 3 outlines nine recommended steps for planning and carrying out any program evaluation. Chapter 4 discusses ongoing monitoring systems, consumer satisfaction surveys, implementation analysis, and participant observation and qualitative interviewing as methods of program monitoring and process evaluation. Chapter 5 discusses uses of experimental control studies, uncontrolled follow-up studies, and pre- and post-test design strategies in outcome evaluation. Chapter 6 provides a summary including precautions for using program evaluation. A glossary of terms, a data collection instrument checklist, and sample monitoring forms are appended. (LLL)