[list][*]Researchers intended to encourage students to build [b][i]robust[/i][/b] constructions, i.e. constructions preserved by dragging[br][/*][*][size=150][size=100]Students preferred to investigate in [b][i]soft[/i][/b] constructions, “in which one of the chosen properties is purposely constructed by eye, allowing the locus of permissible figures to be built up in an empirical manner under the control of the student.[/size][/size][size=100]”[/size][br][/*][/list][size=150][size=100][list][/list][/size][/size][size=100][list][/list][list][size=150][/size][/list][/size]

[size=85]Healy,L. (2000). Identifying and explaining geometrical relationship: interactions[br]with robust and soft Cabri constructions. In T. Nakahara and M.Koyama (Eds.), [i]Proceedingsof the 24th Conference of the International Group for the Psychology of Mathematics Education[/i],(Vol.1, p.103–117) Hiroshima: Hiroshima University. [/size]