Computer software validation is the process of gathering objective evidence that software fulfills its intended use and meets user needs in the environment where it will operate. It helps determine whether a product addresses the right problem for its users—not merely whether its code matches written specifications.
What does software validation mean?
NASA defines software validation as “Confirmation that the product, as provided (or as it will be provided), fulfills its intended use.” In practical terms, a team gathers evidence that the software can serve its users’ tasks and stakeholder expectations in its intended operating environment. The definition applies to a product being developed as well as one being delivered. NASA NPR 7150.2C
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How is validation different from verification?
Verification and validation answer different questions. Verification checks whether a product properly reflects its specified requirements; validation checks whether the product fulfills its intended use. The shorthand is “Are we building the product right?” for verification and “Are we building the right product?” for validation. NASA’s IV&V Program uses these questions to explain the distinction.
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Does software validation mean testing?
No. Testing can provide validation evidence, but validation is broader than testing. Depending on the intended use and project, evidence may also come from reviews, inspections, analysis, prototypes, functional demonstrations, simulations, or demonstrations in an operational environment. NASA’s software requirements guidance treats these as possible methods rather than a single universal checklist.
For example, a team might use a prototype demonstration to learn whether a workflow supports the user’s task, then use testing in a representative environment to gather evidence about system behavior. The methods should suit the intended use; no single method is automatically sufficient for every product.
How is a validation effort planned and carried out?
Validation should be planned across the software life cycle, with activities, methods, environments, and criteria selected before evidence is gathered. NASA’s guidance describes a practical product-validation sequence:
- Prepare: Identify stakeholder expectations, intended users and tasks, the operational environment, planned methods, and criteria for judging results.
- Conduct the planned validation: Use appropriate reviews, demonstrations, tests, analysis, simulations, or other selected methods.
- Analyze results: Compare the evidence with the criteria, examine unexpected behavior, and identify unresolved findings or assumptions.
- Report and retain the work products: Record results and track findings so the basis for conclusions is clear. NASA Systems Engineering Handbook: Product Validation
Whenever possible, NASA’s handbook says validation should involve anticipated operators or users and take place within the intended operational environments. A plan should make clear how the evidence relates to stakeholder expectations, not just list test cases.
What can validation evidence establish?
Validation builds a reasoned body of evidence; it cannot demonstrate every possible behavior under every real-world condition. Software can have many logic paths, stimuli, and environmental conditions, making exhaustive representation impractical. NASA’s software engineering handbook guidance on validation planning emphasizes choosing appropriate methods and accounting for assumptions and modeling limits.
When interpreting a result, consider whether the evidence reflects the relevant user task, operating conditions, and acceptance criteria. A successful test or simulation supports a conclusion about the conditions it covered; it should not be presented as proof of behavior in every circumstance.
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How do standards relate to software validation?
Standards provide process context, but their edition and scope matter. IEEE and IEC identify ISO/IEC/IEEE 12207:2026 as a framework for software life-cycle processes that include acquisition, development, operation, maintenance, and disposal. The public summaries do not establish detailed validation requirements for a particular clause, so clause-level claims require consulting the standard text. IEEE Standards Association: IEEE/ISO/IEC 12207-2026; IEC: ISO/IEC/IEEE 12207:2026
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteNASA’s software engineering requirements cite definitions from ISO/IEC/IEEE 12207:2017 and IEEE 1012. Those NASA requirements are guidance for NASA’s context, not a universal legal requirement for every software team. NASA NPR 7150.2C
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