Process Validation vs CPV
Proving the process works vs proving it stays working.
What a comparison is not
A comparison is SPEQ’s reading of how two published documents differ. Neither is the right answer, it is not a determination of which applies to you, and neither is summarised in a way that replaces reading it.
Modern process validation is a lifecycle: Stage 1 (Process Design), Stage 2 (Process Qualification — the PPQ runs that demonstrate the process is reproducible), and Stage 3 (Continued Process Verification). People often say “process validation” to mean the Stage 2 PPQ event and treat Stage 3 as an afterthought — but CPV is what keeps the validated state alive in routine production.
| ASPECT | PROCESS VALIDATION | CPV |
|---|---|---|
| Lifecycle stage | Stage 1 design + Stage 2 qualification (PPQ) | Stage 3 — ongoing, for the commercial life of the product |
| Question | Is the process capable and reproducible? | Is the process still in a state of control, batch after batch? |
| Nature | A defined study/event (protocol → PPQ runs → report) | A continuous monitoring programme |
| Tools | Process characterisation, DoE, PPQ acceptance criteria | SPC/trending of CQAs and CPPs; periodic review |
| Outcome | Justified commercial process; approval to proceed | Early detection of drift; triggers investigation/CAPA |
| Common gap | Treating three PPQ batches as “done forever” | No living monitoring plan → validated state silently decays |
You are in process validation (Stage 1–2) when you design the process and run the PPQ to demonstrate, with high assurance, that it reproducibly makes conforming product.
You are in CPV (Stage 3) when the product is commercial and you continuously monitor CQAs and CPPs to confirm the process remains in control — detecting drift before it becomes a failure.
Process validation proves the process works; CPV proves it keeps working. The 2011 FDA process-validation guidance made this explicit by framing validation as a three-stage lifecycle, not a one-time three-batch event. The recurring finding is a firm that nailed the PPQ and then had no living CPV programme — so drift went unseen until a batch failed. Stage 3 is not optional paperwork; it is the mechanism that maintains the validated state.
Process Validation vs CPV: frequently asked questions
Common questions on how Process Validation and CPV differ and when each applies.
Is process validation just three batches?
No — that is a common misconception. The FDA’s 2011 guidance frames validation as a lifecycle: process design (Stage 1), process qualification including PPQ (Stage 2), and continued process verification (Stage 3). The number of PPQ batches is risk-based, not fixed at three, and Stage 3 continues for the product’s commercial life.
What is Continued Process Verification?
CPV (Stage 3) is the ongoing programme that monitors critical quality attributes and critical process parameters in routine production to confirm the process stays in a state of control, using trending/SPC and periodic review to catch drift early.
How does CPV relate to the Annual Product Review?
They are complementary. CPV is a continuous, near-real-time monitoring activity; the product quality review (APR/PQR) is a periodic (usually annual) retrospective assessment. A strong CPV programme feeds directly into the APR.
Does the EU use the same three-stage model?
The concepts align. EU GMP Annex 15 and the EMA process-validation guideline embrace lifecycle validation and ongoing process verification, consistent with the FDA’s three-stage framework, though the terminology differs slightly.