This study has focused on the adjustment process of students who made the environmental transition from elementary to junior high school. Changes in and effects of a wide range of variables associated with the transition and educational attempts to ease the transition were reviewed as follows: changes in the school and classroom environments between elementary and junior high school, students' beliefs and behaviors before and after the transition, factors influencing students' adjustment process, and educational prevention programs that would facilitate the students' adjustment. Based on the above findings, the nature of adjustment process in the environmental transition was discussed from the viewpoints of the person-in-environment transaction approach, together with several attached problems.