1. Michigan State University, and she holds a joint appointment at that university and the University of Haifa. She can be contacted at the University of Haifa, Education, Brazil Building, 304, Haifa 31905, Israel;
. Focusing on issues related to mathematics education, she investigates the implications of the assumption that human thinking is a particular case of communicative activity.
2. Oranim Teachers College. She may be contacted at 52 Arlozorov, Haifa 33651, Israel. Her area of specialization is mathematics education. She has taught high school mathematics for many years, first in Gomel, Belarus, and then in Israel. The empirical study presented in this article was implemented as a part of her PhD project