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Reliability and Validity

Reliability and validity are essential to measurements and research procedure designs. These two concepts are distinct yet related. While high reliability does not warrant validity, a study cannot achieve validity without reliability.

  • Reliability is the consistency of your measurement, or the degree to which an instrument measures the same way each time it is used under the same condition with the same subjects and the testing procedure is free from random errors of measurement.
  • Validity is how close what is being measured on the paper is to what we intend to measure in our theory. It eventually leads to how close our conclusion based on the measurement results are to the truth.

Look for these in the Mental Measurements Yearbook test review. If not there, or more is needed, search for journal articles which may include them.

  • Do a search in EBSCOhost, selecting both PsycInfo and PsycArticles.
  • Add the terms "Reliability" or "Validity" to the search. Example: In the Find box, type slosson intelligence and validity