Introduction

Ask five quality managers to define “verification” and “validation,” and you’ll often get five different answers – usually somewhere between “they’re basically the same thing” and a long pause. As a food safety auditor, this is one of the most common points of confusion I see, and it’s also one of the fastest ways to land a non-conformance during a  BRCGS, SQF, or FDA audit.

The good news: once you understand the distinction, it’s straightforward – and it changes how you build,document, and defend your food safety system.

What Is Validation?

Validation asks one question: will this control measure actually work? Under FSMA’s Preventive Controls for Human Food rule (21 CFR 117.3), validation means “obtaining and evaluating scientific and technical evidence that a control measure … is capable of effectively controlling the identified hazard.” Codex Alimentarius’ HACCP guidance defines it almost identically: gathering evidence that the elements of your HACCP plan are effective.

In plain terms, validation is proof of design. It happens before a control is relied upon in production, and it must be repeated any time something changes that could affect whether the control still works — a new piece of equipment, a reformulated recipe,  or a new raw material supplier.

What validation evidence actually looks like:

• Peer-reviewed scientific literature (e.g., published pathogen lethality studies)
• In-plant validation studies — challenge studies, thermal mapping, heat distribution studies
• Regulatory guidance — CFIA publications, FDA and USDA “safe harbor” processes
• Equipment specifications from the manufacturer (validated flow rates, temperature capability)

Under FSMA, validation of process preventive controls must be completed by, or overseen by, a
Preventive Controls Qualified Individual (PCQI) – either before the food safety plan is implemented, or with in 90 calendar days after production of the applicable food first begins (21 CFR 117.160). If a longer time frame is needed, the PCQI must provide written justification. Not every preventive control requires this kind of validation – sanitation, allergen, supply-chain, and recall controls are typically exempt under 117.160(c) – but process controls, like a kill step, almost always do.

What Is Verification?

Verification asks a different question: are we actually doing what we said we’d do? It’s the ongoing, post-implementation confirmation that a  validated control is being applied consistently on the floor. Under 21 CFR 117.155 and 117.165, verification includes reviewing  monitoring records, confirming corrective actions were properly carried out, and periodically  reassessing that the plan overall is working – plus documenting all of it.

What verification looks like day to day:

• Reviewing CCP logs and monitoring records – FSMA requires this within 7 working days of the record being created
• Direct observation of staff performing a task – watching, not just reading a log
• Testing — environmental monitoring, finished product testing
• Internal audits confirming the system as a whole is functioning

Why the Distinction Matters

Both concepts sit at the center of every major food safety framework: FSMA (117.155/117.160), Codex HACCP, ISO 22000:2018 (Clause 8.5.3 for validation, Clause 8.8 for verification), and FSSC 22000 (currently Version 7.0). None of them treat validation and verification as interchangeable – and auditors won’t either.

Handing an auditor a stack of daily log sheets when they ask “how do you know this process is effective?” is a classic gap: you’ve shown verification, not validation. Design and execution are both required, and neither substitutes for the other.

Three Real-World Examples

• Thermal processing: Validation is the challenge study or scientific literature proving a specific time/temperature combination achieves the required pathogen log-reduction. Verification is the daily CCP log review, calibration checks, and periodic re-validation whenever the oven, recipe, or line speed changes. 
• Environmental monitoring for Listeria: Validation is establishing, scientifically, that your sanitation SOP and chemical concentrations are capable of eliminating environmental pathogens. Verification is the routine swabbing program, Zone 1-3 trending, and corrective action when you get a positive.
• Metal detection: Validation is confirming the detector reliably picks up the specified test piece size at full production line speed. Verification is the shift-start/shift-end test piece check and the record review confirming it actually happened.

Closing the Gap Before Your Next Audit

• Revisit your validation file whenever something changes – equipment, recipe, supplier, or line speed. A validation study from five years ago on a machine you’ve since replaced isn’t worth much.
• Don’t let verification become a rubber stamp. If your records are signed off for an entire week in the same pen on a Monday morning, that’s a red flag to an auditor – and a signal that a check isn’t meaningful.
• Make sure your team can explain the difference. If your operators – not just your QA manager understand what they’re verifying and why it was validated that way, you’re in a much stronger position when the auditor starts asking questions.

Building a defensible verification and validation program isn’t a one off task — it’s exactly what we cover, in depth, in our Verification & Validation training. If you’d like your team to walk away able to build, defend, and audit-proof both sides of this equation, get in touch at www.decodingfoodsafety.com to learn more about the course

Sources & Further Reading

21 CFR 117.3 — Definitions (Validation, Verification) –
https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-117/subpart-A/section-117.3

21 CFR 117.155 — Verification of preventive controls –
https://www.law.cornell.edu/cfr/text/21/117.155

21 CFR 117.160 — Validation –
https://www.law.cornell.edu/cfr/text/21/117.160

21 CFR 117.165 — Verification of implementation and effectiveness –
https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-117/subpart-C/section-117.165

Codex Alimentarius CXC 1-1969, General Principles of Food Hygiene (HACCP Annex) –
https://www.isdi.org/wp-content/uploads/2020/04/CAC-RCP-1-1969.pdf

FAO — HACCP Toolbox, Step 11: Validation and Verification –
https://www.fao.org/good-hygiene-practices-haccp-toolbox/haccp/step-11-validation-and-verification/en

ISO 22000:2018 (ISO Online Browsing Platform) –
https://www.iso.org/obp/ui/#iso:std:iso:22000:ed-2:v1:en

FSSC 22000 — Scheme Documents (Version 7.0) –
https://www.fssc.com/fssc-22000/scheme-documents/

CFIA — Verification procedures –
https://inspection.canada.ca/en/food-safety-industry/preventive-control-plans/verification-procedures

USDA FSIS — HACCP Validation guidance –
https://www.fsis.usda.gov/inspection/compliance-guidance/haccp/haccp-validation