Tests and Measurements: Reliability Definition: Consistency of scores Test - Retest Reliability Across time Can you repeat the test and get the same results? Alternate forms can be used to reduce the chances of becoming test-wise Internal Reliability Split-half Can you split the test items and each half give you the same results?

Tests and Measurements: Validity Definition: The ability of a test to measure what it was designed to test Face validity Does it look like it measures what it is suppose to measure? Content validity Do the test items represent the trait in question? Criterion validity Does the difference in scores indicate real differences in behavior? Concurrent validity Predictive validity Construct validity Does the construction of the test reflect the theory on which it is based?