Abstract:
This paper reports on the design of a dynamic environment for the learning of stereometry
(DALEST) and the teaching of spatial geometry and visual thinking. The development of the
software was in the framework of DALEST project which aimed at developing a dynamic threedimensional
geometry microworld that enables students to construct, observe and manipulate
geometrical figures in space, and to focus on modelling geometric situations. The environment will also,
support teachers in helping their students to construct a suitable understanding of stereometry. During
the developmental process of software applications the key elements of spatial ability and visualization
were carefully taken into consideration with emphasis on enhancing dynamic visualization as an act of
construction of transformations between external media and student’s mind.
