Data from the grade 8 and grade 10 science tests of the National Education Longitudinal Study of 1988 (NELS:88) were used to demonstrate that achievement tests are multidimensional and that using psychologically meaningful subscores in national surveys can enhance test validity and usefulness. (SLD)

This study demonstrates that the validity and usefulness of mathematics achievement tests can be improved by defining psychologically meaningful subscores that yield differential relations with student, teacher, and school variables. The eighth- and tenth-grade mathematics tests from the National Education Longitudinal Study of 1988 (NELS:88) were…