Item response theory (IRT) methodology is introduced as a tool for improving assessment instruments used with people who have disabilities. Need for this approach in rehabilitation is emphasized; differences between IRT and classical test theory are clarified. Concepts essential to understanding IRT are defined, necessary data assumptions are…

This study used meta-analysis research techniques to determine if there are differences in General Aptitude Test Battery (GATB) validities and test scores between males and females. The sample consisted of 26,111 subjects from 122 Specific Aptitude Test Battery (SATB) validation or revalidation studies analyzed since 1972. Four approaches were…

The United States Employment Service is now able to expand the General Aptitude Test Battery (GATB) coverage from approximately 400 jobs to all candidates for every job in the Dictionary of Occupational Titles (over 12,000 occupations). In addition, employers can now receive more useful feedback on applicants. Instead of reporting whether a…

The structure of this report is as follows: First, specific aptitude theory and general ability theory, the two theories of the relation between ability and job performance, are presented and differentiated. Second, there is a discussion of problems in the current use of the General Aptitude Test Battery (GATB) and of problems in the use of…

This paper reviews the now massive general literature showing that psychological tests are fair to minorities. This literature shows that there is no single group validity, there is no differential validity, and tests overpredict rather than underpredict minority job performance. Further evidence in regard to blacks is introduced from 51…