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SESK: Stuff Everyone Should Know · sesk.info/eng-verification-versus-validation

Which test question is validation meant to answer?

Validation asks, does it fulfill the intended use?

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  1. Was it finished on budget?
  2. Did it meet each written requirement only?
  3. Does it work for users in context? ✔

Why: Verification checks compliance with specified requirements. Validation checks whether a prototype or product actually serves its intended purpose in a realistic operating environment.

Huh, didn't know that: Models and prototypes can support validation during development, not only after the final product is built.

The dad joke
Verification checked the recipe, validation tasted the result.
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References

Answer: Does it work for users in context?. Verification checks compliance with specified requirements. Validation checks whether a prototype or product actually serves its intended purpose in a realistic operating environment.

  1. NASA Systems Engineering Handbook, 5.4 Product Validation www.nasa.gov/reference/5-4-product-validation
    verification proves whether the product was done right, validation proves whether the right product was done
    Checked 2026-10-10.

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