Based on a decade of evaluation experience, the Center for Substance Abuse Treatment (CSAT) has developed the Integrated Evaluation Methods (IEM) Package, a series of conceptual and methodological applications to enhance CSAT-funded evaluation activities. Products in the IEM Package are organized within an evaluation framework constructed on the basis of accumulated experiences among evaluation professionals. The framework is based upon evaluation strategies, structures, and approaches appropriate for substance abuse treatment evaluators and providers. This document is specifically aimed at supporting the design stage of the evaluation process. It provides a definition of logic models and discusses their use in treatment services planning and evaluation. It is intended to assist substance abuse treatment professionals to plan and conduct statistically valid, and, therefore, meaningful evaluation activities. An appendix entitled "Integrated Evaluation Methods Package: A Guide for Substance Abuse Treatment Knowledge-Generating Activities--Executive Summary" is included. (Contains 4 figures, 3 tables, and 10 references.) (MKA)