Abstract
This study tried to examine the developmental process of self-regulation ability of young children through analyzing records of a 4-year-old kindergarten class with a target child for a year. The analysis revealed the detailed process of developing self-regulation ability with that child's progress of understanding others. Also it illustrated that conflicting but supportive others to that child were involved in that process. It was suggested that this developmental process may be affected by the process of forming a group in a 4-year-old class, which is featured as 'history of interaction', 'creating and sharing standards of the class', and 'understandings of membership of the group.'