Fort Worth Independent School District (FWISD) students scoring at the 77%ile and above were exposed to three different treatments: (1) a Magnet Plan involving the reassignment of students and teachers to special schools; (2) a Vanguard Plan for students and teachers within a school; and (3) unspecified instructional enrichment provided in neighborhood schools. After two years, a comparison of standardized test scores revealed no significant differences in achievement of fifth grade students in the Magnet Plan and students in the Vanguard Plan or in neighborhood schools. However, fourth grade students in the Magnet Plan for one year did achieve significantly more than their counterparts in the other two treatments in vocabulary, language, and mathematics. It was found that students in all three treatments tended to maintain their high achievement, while fourth grade minority students improved their overall performance relative to the national norm group. FWISD students involved in these programs maintained their achievement better than comparable students in these grades just prior to the implementation of the Magnet/Vanguard Plan. (Author/CTM)