With the sand on the sill collaborative IGEO project we achieve three things:
(1) We develop and provide a teaching tool that relies on resources that are available all over the world, namely a coloured sandgrain.
(2) Teachers enhance their students thinking skills by using it in their classroom.
(3) Teachers can use it as a tool to evaluate the geo-thinking skills of their students and one day might even be able compare the students level of “geo-thinking” of their class with the level of “geo-thinking abilities of other students all over the world.