Validity & Reliability

1. Validity: does the test measure what it is suppose to measure?

2. Content Validity Evidence: Does the test measure the instructional objectives

3. Criterion-Related Validity Evidence: Test scores are correlated with an external criterion

4. Concurrent Criterion-Related Validity Evidence: correlating test scores with a criterion measure collected at the same time

5. Predictive Validity Evidence: correlating test scores with a criterion measure collected after a period of time

6. Construct Validity Evidence: whether test results correspond with scores on other variables predicted by some rationale or theory

7. Both Validity & Reliability are important in learning and assessment because information gathered from tests need to be stable, dependable, and consistent in order to better serve students to ensure progress and achievement is evident

8. Reliability: Does the test yield the same or similar score ranking consistently?

9. Test Re-take or Stability: administering the same test twice to the same group of students. The correlation between the 1st set of scores and the 2nd set is determined

10. Alternative Form: administering two alternative or equivalent forms of a test to the same group of students and correlating the scores with the shortest time interval between testing as possible

11. Internal Consistency: single test administration that does not involve a time interval. Involves splitting the test into two equivalent halves to determine the correlation