Which statement best differentiates reliability from validity in counseling assessments?

Which statement best differentiates reliability from validity in counseling assessments?

• A. Reliability is the consistency of scores across time or raters; validity is the extent to which a test measures what it intends. Both are necessary to ensure results are stable and meaningful for decisions.
• B. Reliability measures usefulness, validity measures length.
• C. Reliability and validity are the same concept.
• D. Validity concerns reliability, reliability concerns validity.

Answer: (A)

Reliability is about consistency: if you administer the same assessment under similar conditions, the scores should be stable over time or similar across different raters. Validity is about accuracy: the instrument actually measures the construct it is intended to measure and supports the decisions you make from its results. In counseling, you want both because stable, consistent scores that don’t reflect the intended attribute aren’t useful for guiding decisions, just as a measure that truly reflects the target construct but produces erratic, unreliable results isn’t trustworthy. The statement that reliability concerns consistency and validity concerns measuring what the instrument is supposed to measure, and that both are needed for stable and meaningful results, captures the correct differentiation.