This document discusses different models of evaluation, including the four-level model, utilization-focused evaluation, and expertise/accreditation approaches. The four-level model includes responsive evaluation, goal-free evaluation, adversary/judicial approaches, and consumer-oriented approaches. Utilization-focused evaluation is based on the principle that an evaluation should be judged on its usefulness to intended users by engaging them in the process. Expertise/accreditation approaches rely on professional expertise to evaluate institutions, programs, products, and activities through formal review systems, informal reviews, or ad hoc panel and individual reviews.