Final answer:
A valid measure accurately reflects the concept it is intended to measure, distinguishing it from reliability which ensures consistent results. Validity is critical to research accuracy, and a valid test must also be reliable.
Step-by-step explanation:
A test that is classified as a valid measure is one that measures what it is intended to measure. This refers to the degree to which a given instrument or tool accurately measures the concept it is supposed to measure. Validity ensures that the research or test results are accurate reflections of the variable being measured. It is distinguished from reliability, which refers to the consistency of the measure, or the ability to produce repeatable scores over time. While a valid measure must also be reliable, a reliable measure is not necessarily valid, as it could consistently give inaccurate results.