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An Instructor’s Guide to Understanding Test Reliability ...
An Instructor s Guide to Understanding Test Reliability Craig S. Wells James A. Wollack Testing & Evaluation Services University of Wisconsin 1025 W. Johnson St., #373 Madison, WI 53706 November, 2003 2An Instructor s Guide to Understanding Test Reliability Test Reliability refers to the consistency of scores students would receive on alternate forms of the same test. Due to differences in the exact content being assessed on the alternate forms, environmental variables such as fatigue or lighting, or student error in responding, no two tests will consistently produce identical results.
reliability while good items tend to increase reliability. How does one know if an item is of low or high quality? The answer lies primarily in the item’s discrimination. Items that discriminate between students with different degrees of mastery based on the course content are desirable and will improve reliability. An item is considered to be
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