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Measurement of validity in testing

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If a person were performing an evaluation of a program using an evaluation tool, what information would be necessary to identify whether the tool was reliable and valid?

I know an evaluation tool should be appropriate for what is being evaluated, easy to use, cost-effective, time efficient, valid, and reliable. Using an instrument that is not appropriate for what is intended to be evaluated will lead to the collection of inappropriate information or reaching the inappropriate objectives. Can someone explain measurement validity to me and how this ties in with reliability?

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A decisive look at the measure of validity in testing. Validity is measured through analysis of the following: Content, Criterion, and Construct

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The measurement of validity is measured through the analysis of the following:
1. Content: does the content of the assessment match the instructional objectives?
2. Criterion: does the outcome of the scores match the other predictive outcomes of say another"end of year" exam? Doe the scores give accurate prediction of progress in correspondence with these other ...

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