Prof. Dr. Katja Maaß

University of Education Freiburg
Institute for mathematical education
Kunzenweg 21
D-79117 Freiburg
Germany

Tel.:(+49) - (0)761 – 682 346
Fax.:(+49) - (0)761 – 682 525
E-Mail: Katja.Maass@ph-freiburg.de