Which statement best describes the relationship between ASTM specifications and ASTM test methods?

• A. Specifications define properties and requirements; test methods define how to measure compliance.
• B. Test methods define property requirements.
• C. Specifications define how to measure performance.
• D. ASTM sets wind ratings.

Answer: (A)

Specifications spell out the properties and performance requirements a product must meet, while test methods provide the exact procedures, equipment, and acceptance criteria used to measure those properties and verify compliance. In practice, a specification will reference one or more test methods, and the results of those tests determine whether the product satisfies the spec. Without a spec, a test method has no standard to apply; without a test method, a spec can’t be objectively verified, because there’s no consistent way to measure against it. The idea that specifications define how to measure performance isn’t accurate—the measurement procedures come from the test methods, while the specification states what performance is required.