CSA
Computer Software Assurance
What a definition is not
A definition is SPEQ’s plain-language decode of how a term is used in practice, cited to the documents that define it. It is a practitioner reference, not legal or regulatory advice, it does not replace the definition in the source, and where a regulator’s wording differs the regulator’s wording governs.
A risk-based, critical-thinking evolution of CSV promoted by FDA — focusing test effort and documentation on the software functions whose failure would affect patient safety, product quality, or data integrity, rather than exhaustive scripting.
Computer Software Assurance is FDA’s answer to a real problem: traditional computer system validation had drifted into producing documentation volume rather than assurance. Teams wrote exhaustive scripted test protocols for low-risk functions, spent most of their effort on paperwork, and were often no more confident in the software as a result. CSA reorients the effort toward critical thinking about what could actually go wrong.
The method starts by asking whether the software’s intended use has direct impact on product quality, patient safety, or record integrity. High-impact functions get rigorous, often scripted testing. Lower-impact ones can be assured through unscripted testing — exploratory or ad-hoc — or through leveraging supplier activity, with the evidence recorded proportionately. The record can be as light as a pass/fail with the tester, date, and issues found, rather than a full pre-approved script.
Two misreadings are worth avoiding. CSA is not deregulation: the underlying obligations of 21 CFR Part 11, Annex 11, and the predicate rules are unchanged, and high-risk functions arguably get more scrutiny than before. And it is not a licence to skip documentation — it is a licence to stop documenting the trivial exhaustively so that effort moves to where harm could actually occur. GAMP 5 2nd edition aligns with the same thinking.
- —Starts from intended use and impact on patient safety, product quality, or record integrity.
- —High-impact functions get rigorous testing; lower-impact ones can use unscripted or exploratory testing.
- —Records are proportionate — pass/fail with tester, date, and issues can suffice for low risk.
- —Leverages supplier and vendor activity instead of duplicating it.
- —Not deregulation: Part 11, Annex 11, and predicate-rule obligations are unchanged.
- —Aligned with GAMP 5 2nd edition; the FDA guidance addresses production and quality system software.
FDA final guidance, Computer Software Assurance for Production and Quality System Software (September 2025; draft September 2022); applied against 21 CFR Part 11 and the applicable predicate rules; consistent with ISPE GAMP 5 2nd ed. (2022).
Frequently asked questions
What does CSA stand for?
CSA stands for Computer Software Assurance.
What is CSA?
A risk-based, critical-thinking evolution of CSV promoted by FDA — focusing test effort and documentation on the software functions whose failure would affect patient safety, product quality, or data integrity, rather than exhaustive scripting.
Which regulations cover CSA?
FDA final guidance, Computer Software Assurance for Production and Quality System Software (September 2025; draft September 2022); applied against 21 CFR Part 11 and the applicable predicate rules; consistent with ISPE GAMP 5 2nd ed. (2022).