Key points are not available for this paper at this time.
Paul Cobb, Terry Wood, Erna Yackel, Chapter 9: Classrooms as Learning Environments for Teachers and Researchers, Journal for Research in Mathematics Education. Monograph, Vol. 4, Constructivist Views on the Teaching and Learning of Mathematics (1990), pp. 125-146+195-210
Cobb et al. (Mon,) studied this question.