A 'personality test' is a method of assessing human personality constructs. Most personality assessment instruments (despite being loosely referred to as 'personality tests') are in fact introspective (ie. subjective) self-report questionnaire (Q-data) measures or reports of others (L-data) such as rating scales. Attempts to construct actual performance tests of personality have been very limited even though Raymond Cattell with his colleague Frank Warburton compiled a list of over separate 2000 objective test that could be used in constructing objective personality tests.
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