Most educators understand that excessive student mobility contributes to problems in school climate, attendance, and achievement. Research reveals that they believe there is little that can be done about the problem because of its roots in housing instability, poverty, divorce, and other family issues that are beyond the control of the schools. But few are aware that nearly half of school changes are the direct or indirect result of school or district policies and practices, which are directly under administrative control. School personnel "can" make efforts to reduce mobility and mitigate its negative effects on achievement by addressing these policies and practices. This article examines the effects of high mobility on the achievement and morale of students, and on the perceptions of students, teachers, and parents. The author suggests 4 primary consequences of creating stability that can boost student achievement, and offers 20 school- and district-level solutions that can help alleviate the problems associated with high levels of student mobility. (Contains 1 figure.)