![]() ![]() If a test is not reliable, it cannot be valid. A reliable test is one that produces consistent results. In order for a test to be valid, it must first be reliable. Validity is the extent to which a test accurately measures what it is supposed to measure. Reliability engineering is often used in conjunction with quality assurance and safety engineering to ensure that products are safe and reliable. Reliability engineers use tools and techniques such as statistical analysis and probability theory to identify potential sources of failure and to estimate the reliability of systems.
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