Abstract
In 1983, Voeltz and Evans introduced a set of criteria for establishing educational validity. Their intent was to improve the documentation of quality educational programs for learners with severe disabilities. Although the concept of educational validity is sound, we feel that Voeltz and Evans were not justified in rejecting single-subject research methodology as a vehicle for assessing educational validity. The present paper (a) provides a summary of the arguments of Voeltz and Evans against the use of single-subject research designs in establishing educational validity, (b) addresses each of the major concerns of Voeltz and Evans with single-subject research methodology, and (c) demonstrates how single-subject research methodology can be used to demonstrate educational validity.
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