Abstract
This review argues that an hypothesis about longitudinal development may be derived from, and tested exclusively by, cross-sectional data, when the potential sources of interpretive errors are dealt with adequately. The argument is illustrated by using an array of cross-sectional data to validate the hypothesis, important to developmental mediation theory, that the probability of reversal and intradimensional shifts may be described as a logarithmic function of age, the parameters of which are sensitive to experimentally manipulated testing conditions and to individual differences.

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