Direct comparison
CSA vs CSV: Risk-Based vs Scripted Testing
CSA vs CSV: FDA's risk-based, critical-thinking approach versus traditional scripted CSV testing, and when each applies in GxP validation.
Written and maintained by CASRAI Editorial Board
Last updated
Ask CASRAI · included with Regulatory Radar
Ask about CSA vs CSV: Risk-Based vs Scripted Testing
Ask CASRAI answers research-administration questions and cites the passages behind every claim — and says so when the corpus does not cover something, instead of guessing. It comes with a Regulatory Radar subscription at $29 a month, alongside the daily digest of regulatory changes and the dashboard of what changed.
150 questions a day, on this site, over the API, or inside your own tools through the CASRAI MCP server.
Everything CASRAI publishes — this page, the dictionary, the guides and the news — stays free to read, with no account and no card.
How do Computer Software Assurance (CSA), Computer System Validation (CSV) compare side by side?
The table below compares Computer Software Assurance (CSA), Computer System Validation (CSV) across 8 procurement-relevant dimensions, from what it is through effect on part 11 / audit-trail obligations.
Side-by-side comparison
| Dimension | Computer Software Assurance (CSA) | Computer System Validation (CSV) |
|---|---|---|
| What it is | A risk-based method for deciding how much testing rigor a feature needs | The overarching GxP requirement to document that a system works as intended |
| Governing guidance | FDA draft guidance Sept 2022, finalized 24 Sept 2025 — "Computer Software Assurance for Production and Quality System Software" | Decades of GxP practice; formalized industry-wide via ISPE GAMP (now GAMP 5, 2nd edition, July 2022) |
| Formal regulatory scope | Production and quality system software under the Quality System Regulation (21 CFR Part 820) — medical device manufacturing | Broad — applies across GxP systems in pharma, device, clinical, and lab settings |
| Testing approach | Risk-based; favors critical thinking, exploratory/unscripted testing for low-risk functions | Traditionally exhaustive scripted testing of every function, regardless of risk level |
| Documentation burden | Scaled to risk — assurance activity and outcome recorded, not necessarily a full scripted protocol | Comprehensive IQ/OQ/PQ protocols with step-by-step expected vs. actual results for every test case |
| Best fit | Configured COTS software (GAMP Cat. 3/4), low/indirect-risk features, iterative or agile releases | Custom-coded software (GAMP Cat. 5), high-risk functions, features with subtle failure modes |
| Relationship to the other | A method used within a CSV effort — not a separate regulatory requirement or a replacement | The umbrella obligation; can incorporate CSA-style testing for lower-risk features |
| Effect on Part 11 / audit-trail obligations | None — record-keeping, audit-trail, and e-signature requirements are unchanged | Establishes the validated system those record-keeping obligations then apply to |
Common questions
Common questions about Computer Software Assurance (CSA) vs Computer System Validation (CSV)
Is CSA a replacement for CSV?
+
No. CSA is a risk-based method for determining how much testing effort and documentation a given system feature needs — it operates within a CSV effort, not instead of one. A system still has to be validated; CSA changes the proportionality of how that validation evidence is gathered for lower-risk functions.
Does CSA apply outside medical device manufacturing?
+
FDA's CSA guidance is formally scoped to production and quality system software under the Quality System Regulation (21 CFR Part 820), which covers medical device makers. Its risk-based, critical-thinking philosophy has been widely adopted more broadly across pharma and lab GxP systems — partly because GAMP 5's second edition explicitly aligned with it — even though the binding guidance document itself doesn't formally reach those systems.
Does CSA reduce Part 11 audit trail or electronic signature requirements?
+
No. CSA changes how much testing effort goes into proving a feature works correctly; it does not change what electronic records, audit trails, or signatures a validated system must maintain under 21 CFR Part 11 or equivalent rules.
Can CSA and traditional scripted CSV testing be used in the same validation plan?
+
Yes, and in practice this is the common pattern. A single system's validation plan typically applies full scripted testing to its high-risk functions (calculations, interlocks, data-integrity controls) while applying CSA-style risk-based, unscripted testing to its low-risk configuration and usability features.
