IN A STUDY OF FACTORS RELATED TO HIGH AND LOW GEOGRAPHIC MOBILITY, SIXTH-GRADE CHILDREN FROM LOW-INCOME FAMILIES IN DOWNTOWN MINNEAPOLIS WERE COMPARED WITH CHILDREN FROM FAMILIES OF ABOVE AVERAGE INCOME LIVING IN OUTLYING AREAS. LARGE DIFFERENCES WERE FOUND BETWEEN THESE GROUPS IN--FAMILY INCOME, NUMBER OF CHILDREN AND PARENTS PER FAMILY, RACE, SCHOOL ACHIEVEMENT, TEACHER RATINGS, ABSENTEEISM, AND DELINQUENCY RATES. WHEN HIGH MOBILITY STUDENTS (INNER-CITY AND COMPARISON) WERE COMPARED WITH LOW MOBILITY STUDENTS (INNER-CITY AND COMPARISON), SIMILAR DIFFERENCES WERE FOUND. THE LOW MOBILITY STUDENTS COMPARED FAVORABLY ON ALL FACTORS. HOWEVER, DIFFERENCES BETWEEN HIGH AND LOW MOBILITY STUDENTS WERE LESS MARKED IN THE COMPARISON SAMPLE, SUGGESTING THAT EXTENSIVE MOBILITY HAS LESS EFFECT ON CHILDREN OF FAMILIES WITH ABOVE AVERAGE INCOME THAN IT DOES ON THE POOR. (AF)