Abstract
Psychometric tests are available through both commercial and noncommercial sources. The Mental Measurements Yearbook provides adequate classification of the commercially available instruments which it reviews, but the system lacks the detail required to embrace the many concepts of the little-known experimental measures constructed by researchers in education, psychology, and sociology. The 24-category classification system described here is an attempt to order the myriad noncommercially constructed instruments and in so doing make these measures known to researchers. This measurement classification system along with the Directories of Unpublished Experimental Mental Measures for which the system was developed provide behavioral and social science researchers easy access to noncommercially constructed measuring instruments in the fields of education, psychology, and sociology.
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