Content Validity: Whether an assessment measures all aspects of a particular psychological construct.Face Validity: Whether or not an assessment appears to measure the intended psychological construct.This suggests that each question individually is measuring the same psychological construct, suggesting that the assessment is reliable. Conversely, low scores on each specific item should correlate negatively with the score overall. With internally consistent tests, high scores on each specific item should correlate with a higher score on the assessment overall. Internal consistency relates to the relationships between the individual items in the test and the overall score. If the tests scores are broadly similar (not necessarily identical), then the test can be said to be reliable. ![]() If the scores differ significantly between attempts, the test lacks reliability. Test-retest reliability involves giving the assessment to a group of participants two or more times, and evaluating the differences between each attempt. However, more investigation is required to determine if the scores themselves are meaningful, and measure the psychological construct it purports to measure.įrom a classical test theory perspective, there are two primary forms of reliability: Test-retest reliability, and internal consistency.
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