Setting valid cut-off scores for competency.

Results of competency, or certification, tests can have serious consequences for individuals tested, for employers, and for the public. However, the validity of testing outcomes depends not only on the validity of the test's content but also on the validity of the score selected as the passing, or cut-off, score. This article describes procedures and techniques for use by staff development professionals to ensure systematic, rational, and defensible cut-off scores for competency tests.