A comprehensive case study model of assessment developed at Portland State University responds to the need to measure the impact of service-learning on four constituencies (student, faculty, community, and institution). The case studies blend quantitative and qualitative measures in order to determine the most effective and practical tools to measure service-learning impact and to provide feedback for continuous improvement of practice. Insights from the design process and preliminary results have potential value for institutions with similar agendas for service-learning and community partnerships.