Planning and managing learning activities - basic principles, Jere Brophy and Janet Alleman; analysis of the activities in a social studies curriculum, Janet Alleman and Jere Brophy; the task and the teacher - enhancing student thoughtfulness in science, Phyllis C. Blumenfeld; investigating work groups to promote problem solving in mathematics, Thomas L. Good et al; thinking and authority in elementary-school mathematics tasks, Ralph T. Putnam; the tasks of school literacy - trends and issues, Elfrieda H. Hiebert and Charles W. Fisher; designing worthwhile activities in elementary art, Wanda T. May; conclusion - comments on an emerging field, Jere Brophy.