The purpose of this study is to connect theory and practice to develop logical thinking skills within a 2 year research period. This year, we will return to the starting point of what logic is and reconsider the logical thinking ability to be put on in the class of the Japanese language department at the elementary school stage which aims at this research. Based on this, classes shall be created and verified. In doing so, we will consider classes that foster logical thinking skills in the low, middle, and advanced grades.