Department of Psychology, McGill University, Montreal, Quebec (D.S.M. and K.W.B.), and Department of Psychology, University of Michigan, Ann Arbor, Michigan (S.C.) tests in every situation or in every instance of a certain kind of situa tion. Questionnaires administered once are not well suited for access ing information about such vari ability in behavior and affect. In stead, there is implicit aggregation over situations and occasions. Spe cifically, information about mean ingful variation in the expression of personality across occasions and situations is lost.
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Moskowitz et al. (1997) studied this question.
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