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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?