
Assessing fifth grade children's rational number knowledge in a non-verbal application context: the darts game
In: Recherches en didactique des mathématiques, Jg. 7 H. 3, S. 51-74
Bericht von der 1985er PME-Tagung
In: Zentralblatt für Didaktik der Mathematik, Jg. 18 H. 2, S. 69-71


Construct a sum: a measure of children's understanding of fraction size
In: Journal for research in mathematics education, Jg. 16 H. 2, S. 120-131

Identifying fractions on number lines
In: Journal for research in mathematics education, Jg. 19 H. 3, S. 215-232
Kalküle, Spiele und Lernen
In: Der Mathematikunterricht, Jg. 28 H. 6, S. 6-17
Letter to the editor of JMB
In: The Journal of Mathematical Behavior, Jg. 3 H. 2, S. 188-192



Order and equivalence of rational numbers: a cognitive analysis
In: Journal for research in mathematics education, Jg. 16 H. 1, S. 18-36
Order and equivalence of rational numbers: a clinical teaching experiment
In: Journal for research in mathematics education, Jg. 15 H. 5, S. 323-341
On children's quantitative concept of rational number: construct and estimate the sum
In: Proceedings of the fifth annual meeting: Montréal Sept. 29 - Oct. 1, 1983 = actes de la cinquième rencontre annuelle / PME-NA, North American Chapter of the International Group for the Psychology of Mathematics Education, Jg. vol. 2, S. 272-2791983
Inconsistent student behavior in applicational situations of mathematics
In: Proceedings of the Ninth International Conference for the Psychology of Mathematics Education, Jg. vol. 1: Individual contributions, S. 362-3681985

Research problems in mathematics education - III
In: For the learning of mathematics, Jg. 4 H. 3, S. 22-23
The role of technology in the cognitive development of mathematics learners
In: The journal of mathematical behavior, Jg. 5 H. 2, S. 209-232
