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of Personnel Evaluation in Education Vol 1, 9-23.
Slavin. R. E. (1990). Ability grouping and students achievement in secondary schools : A best-evidence synthesis. Review of Educational Research, 60, 471-499 1. 서 론 1
2. 이론적 배경 2
2.1 수준별 수업 2
2.2 학업성취도 3
3. 연구 설계 4
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