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A major revolution has taken place during the past decade in educational research and our understanding of some of the factors that directly influence learning in or out of the schools. As a result, student learning can now be improved greatly and it is possible to describe the favourable learning conditions which can enable virtually all students to learn to a high standard. Researchers who were at one time concerned about providing equality of educational opportunity for students now speak of the learning conditions which can bring about virtual equality of educational outcomes for students. And such educational outcomes are at very high levels of attainment.
Benjamin S. Bloom (Sun,) studied this question.