Abstract
Cattell's basic strategy in personality research has been first to establish personality factors for each of three major types of measurement, rating (Life-Record), questionnaire (Self-Rating), and objective tests, then to compare factors from one realm with factors from another (7). A factor in any one realm is established in the first place by being replicated. As Cattell says (4, p. 291): “… a functionally unitary trait or process should nevertheless not be considered established by a pattern in a single factor analytic research, but must reappear consistently and persistently in independently rotated studies.”

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