Validity & Reliability of Assessments
by Tanja Hamman
1. Validity
1.1. Content Validity Evidence
1.1.1. Test Questions vs Instructional Objectives
1.2. Criterion Related Validity Evidence
1.2.1. Concurrent
1.2.1.1. Given same time as assessment
1.2.2. Predictive
1.2.2.1. Predicts future outcomes
1.3. Construct Validity Evidence
1.3.1. information interacts with outside factors related to genre/topic of test
2. Reliability
2.1. Test-Retest (Stability)
2.1.1. Test given twice
2.2. Alternate Forms (Equivalence)
2.2.1. 2 different types of assessments measuring same body of knowledge
2.3. Internal Consistency
2.3.1. Single concept - multiple questions
2.3.1.1. Split Halves
2.3.1.1.1. 2 Questions - same concept
2.3.1.2. Kuder-Richardson Methods
2.3.1.2.1. KR20
2.3.1.2.2. KR21