ABSTRACT
A variety of psychological and social science problems involve the use of test batteries or instruments that provide scores for an individual on several attributes. The more commonly used measurement devices include achievement and intelligence tests, vocational and interest inventories, and personality questionnaires. Instruments of this kind are used in both theoretical and applied research as predictor variables, covariates, and dependent or criterion measures. Test batteries also provide, often in the form of profiles, the basic information for many applied activities, including differential diagnoses, selection, and classification. Although test batteries are used for such a variety of purposes and with varying methodologies, there is a common problem inherent in their use; namely, to what extent do the scores of purportedly distinct attributes provide independent and reliable information?
