Cases have been recommended as an important instructional tool for developing professional knowledge across disciplines. In this paper, we begin by defining case methods, a potentially valuable instructional tool for encouraging authentic, active learning. We describe our approach to the design and use of instructional design (ID) cases, and go on to report on the design and use of a Web-based ID case in a team case competition involving six universities. Students and most officials were enthusiastic about the use Of lD cases and about this event. Team collaboration and competition were noted as motivating factors for students. The findings are being used to inform ongoing research and development, which is also described.