Collaborative mathematical investigations with the computer : learning materials and teacher help

Abstract

Wolters and co-promotor Rijkje Dekker.You have both been fantastic, as a team and individually.Rijkje, you wrote the proposal and invited me to accept the assignment.I am very pleased that I did so, and not in the least for being coached by you.During the initial phase of the project, colleagues might have been surprised to hear us laugh so loudly at the beginning of our meetings, which always freed up our minds for the work ahead.You are wise and sensitive, and I admire the way you offer criticism, minimal and essential, without harming the work of others.You made me grow.Bernadette, intuitive, strategic and considerate.You encouraged me to develop my own educational research style.Creating a transparent atmosphere in supervision sessions, you always paid attention to my personal well-being, which turned out to be extremely important for conducting research in all phases of