Nguyen, Danh Nam2014-01-172014-01-172012http://hdl.handle.net/2003/3244610.17877/DE290R-13968In this paper we investigated the development of the proving process within a dynamic geometry environment in order to provide tertiary students with a strategy for proving. As a result, we classified different levels of proving and designed an interactive help system corresponding with these levels. This help system makes a contribution to bridge the cognitive gaps between conjecture and proof. We also propose three basic conditions for understanding the development of the proving process.enGesellschaft für Didaktik der Mathematik510conference contribution