Intervention programs claiming to benefit young children are increasingly being required to provide evidence of their effectiveness. An Intervention Efficiency Index (IEI) is proposed as a method of measuring child progress and program impact by relating changes in children's developmental capabilities to time spent in a program. A series of steps involved in computing an IEI is presented. Research data supporting application of the IEI in two different preschool programs for handicapped children are analyzed and discussed.
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Bagnato et al. (1980) studied this question.
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