Test Reliability

Test reliability refers to consistency of measurement, the extent to which a test yields the same results for the same individual over time.

Test Validity

Test validity is the extent to which a test measures what it proports to measure. Also, the extent to which inferences made on the basis of test scores are appropriate, meaningful, and useful.

Methods to Assess Reliability

• Test-retest Reliability
• Alternate Form Reliability
• Internal Consistency Measures of Reliability
  • Split-half Reliability
  • Kuder-Richardson Reliability
  • Cronbach's Alpha

Types of Validity

• Face Validity
• Content Validity
• Criterion Validity
  • Concurrent Validity
  • Predictive Validity
• Construct Validity

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