ABSTRACT
The GEOMETRIC SUPPOSER (Schwartz & Yerushalmy, 1985, in press-a) is a series of microcomputer-based programs that were designed to help students and teachers become makers of mathematics. Two lines of reasoning led to the development of the GEOMETRIC SUPPOSER. The first centers on the almost total absence of the making of conjectures by students (and teachers, for that matter) in the teaching of mathematics.
