Interactivity what does it mean In the context of technology enhanced math learning?

Looking at both environments Cabri 3D and Cabri Elem Creator we want to examine the choices made, at the interface level, particularly about the various manipulation tools at student disposal as well, at the didactic level, about the various features to be used from a didactical perspective helping the design of effective tasks where interactivity is key.

In particular, the specific issue of plane representation (on paper and on a computer or tablet surface) of 3D objects, i.e. of perspective drawing, will be addressed in order to show how the design choices of the computer environment interactivity may help students or even teachers become aware of usual misconceptions.