Shaughnessy, J. Michael. and William F. Burger

Spadework Prior to Deduction in Geometry
Mathematics Teacher

v78 n6 p419-28 Sep 1985

The five levels of the van Hiele theory are described. Then interviewing tasks designed to be presented to students in kindergarten through college are presented. Finally, responses from 14 interviews are discussed, with implications for teaching geometry. Extensive references are included.