This article outlines the arguments for an action research approach to the implementation of STS education, and describes some of the experiences and outcomes of an action research group of six teachers (one elementary, five secondary) based at The Ontario Institute for Studies in Education, Toronto. The teachers' initial views, and their changing perceptions throughout the duration of the project (the 1992-93 academic year), are presented in terms of four categories: the nature of STS education; the development of curriculum materials; personal/professional development; collaborative work. The emergence of an additional complex theme involving reinforcement, extending horizons, and building professional confidence, is considered the most significant outcome of the project.