Validity and Reliability
The instruments selected should be valid and reliable. Information relating to validity and reliability studies can be found in the instruments technical manual, on the publisher’s Web site, or in test review publications.
Validity refers to the degree in which an instrument measures what it purports to measure. Three types of validity are typically reported.
- Content Validity- the degree to which the questions on the test adequately cover or are representative of the domain (intelligence, creativity, leadership, etc.) under consideration.
- Construct Validity- the degree to which an instrument measures the domain or construct that is purports to measure.
- Criterion-Predictive Validity- the degree to which the test can predict performance on another measure that assesses the same area in a different way.
Reliability refers to the degree to which a test is consistent and stable over time in measuring what it is intended to measure.
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Reprinted with the permission of Duke University. © 2008 Duke University Talent Identification Program.
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