Eighty-seven percent of all Wake County Public School System (WCPSS) students instructed during 2002-03 were continuously enrolled (CE) in one school from the first week of the school year until the last day of school. Across grade levels CE percentages steadily increased from only 82% in kindergarten to 94% in grade 12, except for a dip to 83% in ninth grade that was primarily due to dropouts. A majority of the students who were not continuously enrolled from the first week (MOBILE) were African-American/Black or Hispanic/Latino, and students in the MOBILE group were much more likely to come from low-income families than were students in the CE group. Passing rates and average scale scores on 5th, 8th, and 10th grade End-of-Grade (EOG) tests were lower for the MOBILE group than for the CE group in almost every comparison, even when controlling for ethnicity and family income differences. Tables and figures are attached. [Contributing Staff: Chuck Dulaney and Karen E. Banks.]