Volume 3 of a three-volume study of science education in Canadian schools, reporting 8 case studies of science teaching in action in Canadian schools. Sites for intensive study were selected to include a diversity of both regions and school settings and at each school site, various kinds of information were collected to obtain as complete a picture as possible. Major issues addressed include integration and options as forms of curriculum organization, socialization as a priority, the inquiry approach and understanding, and the dynamics of change and dilemmas of practice.