Reliability/Validity

1. Inflated Results on speeded test and should only be utilized for measuring a single unitary trait.

2. Reliability - measures the stability of the test results through the measurement of score rankings of the same or similar test.

2.1. Test-Retest or Stability - suggest that the same test be aministered to the same group with minimal time between the test.

2.2. Alternate Forms of Equivalence - suggest that alternate/equivalent test of the same material be given to the same group with minimal time between adminstration of the test.

2.3. Internal Consistency - measures consistency through the measurement of like items.

2.3.1. Split-Half Methods - for measuring a single trait.

2.3.2. Kuder Richardson Methods - determine the extent to which the entire test represents a single fairly consistent measure of a concept.

3. Validity - measurement utilized to see if a test is measuring what it should measure.

3.1. Content - compares test items to their objectives.

3.2. Criterion Related - numerical estimate of evidence established by measuring test scores against an external standard.

3.2.1. Concurrent Criterion = determined by measuring scores against a measure collected at the same time.

3.2.2. Predictive Validity Evidence - determined by measuring scores against a measure collected over a period of time.

3.3. Construct Validity - meaure scores against scores on other variables that are utilizing the same rationale or theory.

4. Ensure confidence that the test material is effective measuring the skill trait or attribute that we are trying to measure.