Over the last 15 years or so, research into measurement error has begun to consider not just whether the test items fit, but whether the people who answer the items fit. Attempts to systematically identify people who do not fit the typical pattern have led to several "person-fit statistics." This digest describes the need for such…

This digest describes some of the basic logic-of-evaluation skills and some of the basic methodological skills that need to be mastered in order to practice the art and science of evaluation. Some topics from the logic of evaluation that must be dealt with include understanding : (1) the differences and connections between evaluation and other…