This article explores the idea that teachers can improve their practice through reflection and action research. The author discusses the constructivist and socio-constructivist roots of action research. The case study explores the use of a project to improve learner autonomy and cooperation. Students made key decisions about the project content, the size of the groups, and the roles that each member would play. To evaluate the experience, the instructor asked students open-ended questions. A colleague-observer filled out rating scales about instructor and student behaviors.