One of a series of booklets on disability research, this paper is intended as an introduction to the role of evaluation in the utilization process. Its purpose is to help disability researchers grasp the importance of incorporating a focus on assessing use into plans for disseminating research outcomes. The paper begins by examining basic evaluation principles as they relate to dissemination and utilization, including: (1) evaluation is more than a compliance activity, its goal is improvement; (2) evaluation is not research; (3) effective evaluation must meet basic criteria relating to utility, feasibility, propriety, and accuracy; (4) there is no single, best way to do an evaluation; and (5) there are multiple dimensions to measuring use. The paper then describes the major steps involved in evaluation planning, including: determine who the intended users of the evaluation are, identify the purpose of the evaluation, specify the questions that the evaluation needs to answer, specify evaluation criteria, and identify evaluation methods. The paper concludes with a list of eight "use-deadly" sins that researchers should avoid. (CR)