![]() A test can be reliable but not measure what it is meant to measure. ![]() The darts in the dartboard in the figure to the right are in the same place, but not in the right place. VALIDITY EXPLAINED Reliable but not validīeing reliable is not good enough on its own. It is useful visually to think of a dartboard in the diagram to the right, darts have landed all over the board-they are not reliably in any one place.In order for an assessment to be reliable, there needs to be a predictable authoring process, effective beta testing of items, trustworthy delivery to all the devices used to give the assessment, good-quality post-assessment reporting and effective analytics. An unreliable assessment does not measure anything consistently and cannot be used for any trustable measure of competency. A test with poor reliability might result in very different scores across the two instances. If you were to deliver an assessment with high reliability to the same participant on two occasions, you would be very likely to reach the same conclusions about the participant’s knowledge or skills. ![]() ![]() RELIABILITY EXPLAINED Not reliableĪn assessment is reliable if it measures the same thing consistently and reproducibly. How can you trust assessment results? The two keys are reliability and validity.
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