![]() ![]() Reliability:įrom a classical test theory perspective, there are two primary forms of reliability: Test-retest reliability, and internal consistency. However, more investigation is required to determine if the scores themselves are meaningful, and measure the psychological construct it purports to measure. For example, if a student completes a psychometric assessment 10 times, and gets the exact same score each time, the assessment can be said to show “reliability”. As a result, reliability is required for validity, but not necessarily the other way around. Validity however, answers the question “does this assessment actually measure the construct it claims to?”. Put simply, reliability relates to the precision, accuracy, and replicability of psychometric test scores. In the context of psychometric testing, reliability and validity are related, but are ultimately separate constructs. ![]()
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