TOP SELF, that is, Trial of Prevention School Education for Life and Friendship, has been introduced in Yamasaki, Sasaki, Uchida, Katsuma, & Matsumoto（2011）. The aim of the present paper is to describe how the program purposes have been developed and constructed in order to cultivate prosociality among children. Firstly, the purposes of education to cultivate prosociality among children are explained. Secondly, the construction of hierarchical purposes which is determined on the basis of literature review is illustrated. The construction of the purposes includes constituent, intermediate, subordinate and operational purposes. The higher−order purposes contribute to the realization of primary purposes, whereas operational purposes directly relate to the effectuation of education methods. Those purpose are derived from evidence −based outcomes in the literature.