How to Establish Continued Process Verification
Build the Stage 3 monitoring that keeps a validated process in control for its commercial life.
What a how-to is not
A how-to is SPEQ’s practitioner method, not a procedure. It does not replace your own SOP, it is not a validated approach, and the judgement calls in it belong to your quality unit.
Continued Process Verification (CPV) is Stage 3 of the process-validation lifecycle: the ongoing program that monitors a commercial process to confirm it stays in a state of control and to detect drift early. It replaces the old "validate once and forget" mindset. A CPV plan defines what to monitor, how to analyse it, and what triggers action.
- 1
Select the parameters and attributes to monitor
Choose the critical quality attributes (CQAs) and critical process parameters (CPPs) — plus key performance indicators — that reflect whether the process is in control, drawn from the process understanding built in Stage 1.
- 2
Define the monitoring and sampling plan
Specify what data is collected, how often, and the sampling approach, sized to detect meaningful shifts without drowning in noise.
- 3
Choose the statistical methods
Define how the data is analysed — control charts (SPC), capability indices (Cpk), and trend rules — so drift and special-cause variation are detected objectively, not by eyeball.
- 4
Set signals and responses
Define the rules that trigger investigation (out-of-control signals, trends, capability decline) and the response each requires, including escalation to deviation/CAPA.
- 5
Assign ownership and review cadence
Assign who reviews CPV data and how often, and connect the output to the product quality review and management review.
- 6
Feed back into the lifecycle
Use CPV findings to trigger investigation, improvement, or revalidation — CPV is the loop that keeps the validated state alive, not a data-collection exercise.
- !Collecting CPV data but never applying statistical analysis, so drift within specification goes unseen.
- !Monitoring convenient parameters instead of the CQAs/CPPs that actually indicate control.
- !No defined signals or responses, so an out-of-control trend produces no action.
- !CPV disconnected from the product quality review and revalidation decisions.
How to Establish Continued Process Verification: frequently asked questions
Common questions on establish continued process verification.
What is Continued Process Verification?
CPV is Stage 3 of the FDA’s three-stage process-validation lifecycle — the ongoing monitoring of a commercial process (its CQAs and CPPs) to provide continual assurance that it remains in a state of control, detecting drift early and feeding back into improvement and revalidation.
How is CPV different from the initial process validation?
Initial validation (Stages 1–2) establishes that the process is capable and reproducible before routine supply; CPV (Stage 3) confirms it stays that way throughout its commercial life. One is a bounded qualification; the other is continuous.
What statistical tools does CPV use?
Commonly statistical process control (control charts) to detect special-cause variation and trends, and process-capability indices (such as Cpk) to gauge how well the process meets specifications over time. The point is objective detection of drift, not subjective review.
How does CPV relate to the product quality review?
They are complementary. CPV is near-real-time monitoring; the product quality review (APR/PQR) is a periodic retrospective assessment. CPV output is a major input to the APR, and both inform whether the process needs improvement or revalidation.