In assessment, what do reliability and validity mean, and why are they important for student decisions?

• A. Reliability = consistency; validity = measures what it intends; both ensure fair, accurate decisions.
• B. Reliability means fairness; validity means speed.
• C. Both concern test length.
• D. Validity equals reliability.

Answer: (A)

Reliability means the test gives consistent results across occasions, items, or raters, so you’d expect similar scores if a student took it again or if different scorers were used. Validity means the test actually measures what it’s intended to measure—the right skill, knowledge, or construct. When decisions about students (like grades, placement, or advancement) are based on assessment data, you want both: scores that are stable and dependably reflect the intended attribute. If a test is reliable but not valid, you’ll get consistent results that don’t really reflect the target ability. If it’s valid but not reliable, the scores will be too noisy to base decisions on. The choice captures these ideas—reliability as consistency, validity as measuring the intended thing—and why they together support fair, accurate decisions about students.