The following two types of student mobility stand out as causing educational problems: (1) inner-city mobility, which is prompted largely by fluctuations in the job market; and (2) intra-city mobility, which is caused by upward mobility or by poverty and homelessness. Most research indicates that high mobility negatively affects student achievement, particularly when students are from low-income, less-educated families. High student mobility puts an enormous burden on schools. Services developed for one population may need to change; attempts to monitor school performance are hampered by changing school populations. Effective schooling research has provided some suggestions for dealing with highly mobile students, including parent education and handbooks, reception committees and guides, classroom buddies for new students, and inservice training for teachers. Recordkeeping is one of the most severe problems schools face. Approaches that may serve as examples are: (1) the Migrant Student Transfer System, an electronic record system for Puerto Rico and the mainland United States that is beginning to keep student records; (2) an educational passport system for Puerto Rican students moving between Puerto Rico and New York or Connecticut; and (3) a pilot recordkeeping system of the National Center for Education Statistics. Problems that may arise in the search for more efficient recordkeeping include student privacy and school accountability. A list of seven references is included. (SLD)