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Validity - refers to how well a test measures what it is purported to measure.
  • Types of validity:
    • Face validity - measures what it appears to measure; that it is possible.
      • Example, is it plausible that the Ely's Test is an assessment of Rectus Femoris length.
    • Content validity - does it measure all aspects of a content domain.
      • Example, with regard to most assessments and tests in human movement science, content validity is achieved via the combination of face validity, anatomical knowledge and knowledge of relevant research.
    • Criterion validity - justifies the validity of the measuring instrument by comparing it to a gold standard.
      • Example, the degree markings on a goniometer may be compared to a standard protractor to ensure accuracy.
    • Construct validity - the ability of an instrument to measure an abstract concept.
      • Example, does a glutues maximus manual muscle test give an indication of an individuals ability to walk up stairs.