The water-jar Einstellung test as a measure of rigidity.

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Abstract
"The primary purose of the present paper is to examine the validity of the water-jar test as a rigidity measure by critically reviewing studies involving its use as such an index." Correlations between the water-jar test (WJT) and numerous criterion measures are generally statistically nonsignificant. On the basis of several studies it is tentatively concluded that a low negative correlation between the WJT and intelligence exists. The notion that rigidity increases under stress is not supported by the research evidence. The author concludes that evidence for the validity of the WJT is lacking and that the WJT, from a psychometric point of view, is poor. 59 references.

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