Validity is often defined as the extent to which a measurement actually measures what it purports to measure. ... This conceptualization of reliability and validity is less accurate when applied to subjective outcomes such as quality of life.

Are subjective test reliable?

This means that scores on subjective assessments is not always reliable, and that any teaching decisions made from them may be suspect. Institutions and educators need to find ways to ensure the reliability of their subjective assessments. There are ways to increase the reliability of scoring on subjective assessments.

Does reliability affect validity?

Validity refers to how accurately a method measures what it is intended to measure. ... However, reliability on its own is not enough to ensure validity. Even if a test is reliable, it may not accurately reflect the real situation.