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Introduction |
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| Authors: | Monique Boekaerts Peter Nenniger |
| Institution: | 1. Centre for the Study of Education and Instruction, Leiden University, P.O. Box 9555, 2300, Leiden, The Netherlands 2. Centre of Educational Research, University of Koblenz-Landau at Landau, Friedrich-Ebert-Strabe 12, D-76829, Landau |
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