1. 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?

2. 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?