Diversity of instructional needs requires diversity in instructional groups. Teaching all children well requires that they be grouped homogeneously for instruction. Instruction must not be secondary to placement in special education. The ideology of full inclusion works against good instruction in some cases. The ultimate test of special education should be whether a particular student is receiving good instruction that matches his or her needs, not the student's placement.
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Kauffman et al. (2005) studied this question.
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