The authors describe an evolving theoretical framework that has been called one of the best kept secrets of academia: cultural-historical activity theory, the result of proposals Lev Vygotsky first articulated but that his students and followers substantially developed to constitute much expanded forms in its second and third generations. Besides…

Discusses how co-teaching is useful for teaching important aspects of teaching to preservice educators, presenting an episode of masterful questioning from a study about teaching and learning in a science classroom co-taught by an experienced science teacher and a preservice teacher completing an internship. Their work suggests that preservice…