Over the years since the first ICMI study on technology (Howson and Kahane 1986)
when users had to rely solely on text-based input via the keyboard, major innovations
have involved the introduction of direct manipulation graphical capabilities that
have become synonymous with contemporary computers (Norman and Draper
1986). Such changes have impacted particularly on geometry education with the
development of ‘dynamic geometry’ environments (DGEs) such as Cabri and
Sketchpad (and many others).