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Reliability and validity

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Reliability and validity
Reliability and validity are closely related. In order for assessments to be considered high
quality they need to be reliable and valid. A reliable assessment is where the test results are
consistent and provide the same results each time the test is taken. Validity addresses the
question whether the assessment measures what is supposed to measure and how accurate it is
[Ncrel (2015)].
An example of something which is reliable but not considered valid could be this,
Suppose a speed meter in our car shows us every time that we are travelling at 65 km/h when we
are actually travelling at 75 km/h, the reliability or consistency of the speed meter is efficient but
it is not valid or accurate. I do agree that validity is a little more important than reliability. A high
quality assessment needs to be both consistent and accurate so the reliability and validity are
both important but if an assessment does not accurately measure what it is supposed to it would
be of little use even if it measures consistency.

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 Reliability and validity Reliability and validity are closely related. In order for assessments to be considered high quality they need to be reliable and valid. A reliable assessment is where the test results are consistent and provide the same results each time the test is taken. Validity addresses the question whether the assessment measures what is supposed to measure and how accurate it is [Ncrel (2015)]. An example of something which is reliable but not considered valid could be this, Suppose a speed meter in o ...
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