Abstract
A considerable body of literature on early intervention efforts with handicapped and medically at-risk infants exists. Unfortunately, most of this literature addresses issues apart from program impact or provides no objective evaluation outcomes. Assessing the impact of the efficacy studies that are available must be done in the context of the constraints facing intervention researchers. Population variability, inability to execute sound designs, differences in dependent measures and equivalent outcomes impede the drawing of firm and generalizable conclusions. Nevertheless, given these constraints many investigators and reviewers have concluded that early intervention efforts appear to produce positive outcomes on participating infants and their families.

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