What is test reliability?

Whether a test produces consistent results over time. High reliability means if you take the same test twice, your scores are similar.

What is test validity?

Whether a test actually measures what it claims to measure and predicts job performance accurately.

Correlations of 0.30-0.50 with job performance are considered good. Most psychometric tests fall in this range. Validity varies by job and context.

Yes. A test can be consistent (reliable) but not predict job performance (invalid). Professional tests are checked for both.

Peter Kolomiets

|March 30, 2026|Updated Apr 13, 2026|10 min read

Ready to discover your Psychometric?

American Educational Research Association, American Psychological Association, & National Council on Measurement in Education (2014). Standards for Educational and Psychological Testing
McDonald, R. P. (1999). Psychometric Methods: Theory into Practice
Hunter, J. E., & Hunter, R. F. (1984). Meta-Analysis of Predictive Validity

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Peter Kolomiets

|March 30, 2026|Updated Apr 13, 2026|10 min read

Ready to discover your Psychometric?

American Educational Research Association, American Psychological Association, & National Council on Measurement in Education (2014). Standards for Educational and Psychological Testing
McDonald, R. P. (1999). Psychometric Methods: Theory into Practice
Hunter, J. E., & Hunter, R. F. (1984). Meta-Analysis of Predictive Validity