Abstract
The purpose of this study is to solve the problem pointed out by many earlier studies and a lot of teachers that many children of primary schools are weak at spatial cognition. In particular, we focus our study on the stage of "Pre-Sketch Weltanschauung"(the stage where one can recognize for the first time in cognitive development that our living space is three-dimensional), because it is difficult for the students to acquire. In this paper, we made educational contents and educational plans, based on our hypothesis, for the students to acquire the Weltanschauung stage. And we verified them through real educational practices in primary schools. As a result of these practices, the following points became clear: Our plans and contents were useful for children to acquire the Weltanschauung stage. Finally, we made an educational plan for Geometry in elementary school based on the suggestions above.
