You want to ensure that the test or quiz measures the same knowledge for every student who takes it. It answers the question “Does this instrument yield repeatable results?” If you are a teacher, you know that creating a test for assessing students’ knowledge of while loops or conditional statements can be time-consuming. In both cases, we want our instrument (or tool) to be reliable.įor evaluation instruments, reliability is a measure of the consistency and stability of the participants’ results. In computing, when we enter a URL in our browser, we want the browser to return the correct site for that particular URL. When a thermometer is designed and then produced, as a consumer, we want the thermometer to accurately measure the temperature each day. For example, let’s take another instrument we use quite frequently in deciding what to wear every day–the thermometer. Reliability in evaluation instruments is no different than reliability in other instruments used in science-and even computer science.
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