The extent to which an assessment measures what it claims to measure is known as validity. Validity refers to how accurately an assessment or test corresponds to the specific concept or skill it is intended to measure

Key points about validity:

• It indicates the accuracy of the measurement or conclusion drawn from the assessment.
• A valid test truly measures the intended construct and not some other unrelated trait.
• Validity is distinct from reliability; a test can be reliable (consistent results) but not valid (not measuring the right thing), whereas validity implies the test is both accurate and reliable

• There are different types of validity, including:
  • Content validity : Whether the test covers all relevant parts of the subject.
  • Construct validity : Whether the test measures the theoretical construct it claims to measure.
  • Criterion validity : How well test results correlate with an external criterion or outcome

In summary, validity is the correct term for the concept describing the degree to which an assessment measures what it purports to measure