Acceptance criteria that were not derived from process understanding, a continued process verification stage that exists only on paper, and revalidation triggers that are never actually evaluated after changes.
Stage 1 shortcuts show up in Stage 3
When acceptance criteria are set from specification limits rather than from demonstrated process capability, the qualification runs pass and routine production drifts. The lifecycle approach exists precisely to prevent that sequence.
Continued process verification that nobody performs
- Trending plans written but not assigned an owner
- Data collected and never evaluated against a control strategy
- Alert and action limits carried over from qualification without review
- No defined response when a trend breaches an alert limit
Change without re-evaluation
Equipment replacement, supplier change, scale adjustment and even a facility move should each trigger a documented assessment of validation impact. The assessment can conclude that no revalidation is required — but the conclusion has to exist.
Where deep validation engineering belongs
xFDA works on validation strategy, quality system integration and remediation. Detailed commissioning and qualification execution — IQ/OQ/PQ packages, utilities, facility qualification — is specialist engineering work and is best resourced accordingly.
Reviewed by the named consultant. Last updated July 14, 2026. General information only — not regulatory or legal advice for a specific situation.