In this paper, we reviewed the outline of Kegan’s contribution recorded in “Defining and Selecting Key Competencies” (2001) and considered “Reflectivity”. The following became clear. ① The third stage of the developmental stage is sufficient to meet the demands of traditional society. However, in order to survive the post-modern society, we need the fourth stage consciousness not only to distance from social pressure but also distance from our own inner powers, ideologies and fixed ideas will do. ② At school, present a challenging curriculum to students. Also, support for students to acquire the challenging curriculum is necessary. In other words, it is merely training to acquire skills and knowledge, as well as education for mental development and change. This can be said as the purpose of adult education and lifelong education.