Clinical and research implications of revising psychological tests.

This article integrates those of other contributors to this special section, "Methods and Implications of Revising Assessment Instruments," to underscore important conceptual factors to consider when undertaking test revisions. These considerations include determination of when test measures have become sufficiently understood to be incorporated in a test revision, cohort effects, revision of administration formats and test instructions, and comparisons of performance levels across test versions. The discussion of these factors also takes into consideration clinical practice and educational implications of making a transition to revised test versions.