Administration following a standard procedure is undoubtedly the ultimate goal of assessment. Practitioners face the challenge of unexpected events interrupting a formal evaluation, substitution, proration, or a retest, which may be used as alternative strategies to perform estimations. Such nonstandardized estimation strategies have introduced additional… (More)
A single-subject reversal design was used to test the hypothesis that aerobic conditioning would elevate mood in seven clinically depressed persons. The hypothesis was confirmed for two subjects but not for the group as a whole. A reversal design does not appear suitable for this area of investigation.