Case-based teaching in some fields offers competition experiences as prestigious professional benchmarks and development experiences in professional preparation. Case-based team competition in teacher education can offer possibilities for preservice professional growth and development. Case-based teaching also has a natural fit with constructivist principles of teaching educational psychology. The Commonwealth Center Invitational Team Case Competition in May 1993 provided opportunities for educational psychology students to problem solve cooperatively across several performance dimensions. A case competition on the Internet will expand the opportunities for problem-solving and mentoring. Case competition has changed the structure, expectations, and assignments of the educational psychology classes. Preservice teachers have been led to think of themselves as more capable as they examine classroom dilemmas. Two figures present supporting information. (Contains 43 references.) (SLD)