The factorial structure of the California Achievement Test subtests appears to consist of only one common factor in each grade. This study indicates that there is considerable overlap among the subtests and that there is minimal support for the use of subtest scores as measures of independent constructs. (Author/PN)

This study is second in a series demonstrating that achievement tests are multidimensional and that using psychologically meaningful subscores in national educational surveys can enhance test validity and usefulness. National Education Longitudinal Study 1988 (NELS:88) 8th- and 10th-grade science tests were subjected to full information item…

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 National Education Longitudinal Study of 1988 (NELS:88) 8th- and 10th-grade math tests were subjected to full…