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Validity
Validity is the most important single attribute of a good test. Nothing will be gained from assessment unless the assessment has some validity for your purpose.
There are several different types of validity:
- Face validity - do the assessment items appear to be appropriate?
- Content validity - does the assessment content cover what we want to assess?
- Criterion-related validity - how well does the test measure what we want it to?
- Construct validity - are you measuring what you think you're measuring?