The purpose of this study was to conduct a narrative inquiry into how a Korean experienced elementary teacher changed her personal, practical knowledge in the process of learning about classroom management in the graduate school and developing and implementing a self-management program. The researcher and the participant went through a process of collaboration involving mutual storytelling and restorying. Prior to the entrance to the graduate school, the teacher held the knowledge that teachers should establish and enact the rules for classroom management, that material incentives are effective, and that students are not good at self-managing. Recognizing that the teacher-directed classroom management had limited effects on the classroom behaviors of students, she entered the graduate school and acquired new knowledge in a few graduate classes by exchanging narrative on the principles and methods of student-directed classroom management within a knowledge community of fellow teachers and the researcher. She developed a self-management program called a 'credit bankbook' based upon ideas of a french educator Freinet and started to implement the program in her classroom. After implementing the self-management program, the teacher developed the knowledge that students themselves should establish and enact the rules for classroom management, that mental incentives are more effective than the material ones, that students are good at self-managing. The conclusion presents implications of the teacher's experience with the development of the personal, practical knowledge for the enhancement of elementary teachers' knowledge on classroom management.