Commissioning vs Qualification

The two words get used interchangeably on project sites, and the confusion is expensive. It produces either duplicated effort — the same pump tested twice, once by engineering and once by validation — or, worse, a qualification package built on commissioning work that was never controlled well enough to support it.

The short answer

	Commissioning	Qualification
Purpose	Confirm the system was built and works as designed	Provide evidence that GMP-critical aspects perform as intended
Driven by	Engineering and design requirements	Product, process and regulatory requirements
Owner	Engineering / project	Validation, with quality unit approval
Governed by	Good engineering practice	GMP — Annex 15, 21 CFR 210/211
Typical documents	Design reviews, installation checks, FAT, SAT, start-up records	DQ, IQ, OQ, PQ protocols and reports
Approval	Engineering / project lead	Quality unit
Output	A working system handed to the owner	A documented basis for GMP release

What commissioning covers

Commissioning is the disciplined handover of a system from the people who built it to the people who will run it. It verifies that the installation matches the design, that components are correctly specified and fitted, that the system starts, runs and shuts down as intended, and that control loops, interlocks and alarms behave as designed.

It is not a GMP activity. It is an engineering activity — but one that, done well, generates most of the evidence qualification needs.

What qualification covers

Qualification is narrower and deeper. It asks a different question: not “does this work?” but “can we show, with approved documented evidence, that the parts of this which can affect product quality do what the product requires?”

Conventionally that runs in four stages:

• Design Qualification (DQ) — documented verification that the proposed design is suitable for the intended purpose, before it is built.
• Installation Qualification (IQ) — verification that the system as installed matches the approved design, with materials of construction, instrument calibration, utilities and documentation confirmed.
• Operational Qualification (OQ) — verification that the system operates as intended across its operating ranges, including alarms, interlocks and critical control functions.
• Performance Qualification (PQ) — verification that the system performs reproducibly under conditions representing actual use.

Where they overlap — and the leveraging question

Here is the tension: a great deal of what OQ tests, commissioning has already demonstrated. Running the same test twice adds cost and schedule and produces no additional assurance.

ASTM E2500 and the ISPE Baseline Guide Volume 5 resolve this by treating commissioning and qualification as one integrated programme rather than two sequential ones. Verification is planned once, against critical aspects identified by risk assessment, and executed once — with the quality unit approving the approach, the acceptance criteria and the final release rather than re-witnessing every step.

EudraLex Annex 15 supports the same direction, explicitly allowing FAT and SAT information to be used as part of qualification documentation where it is justified and the quality is not affected by transport and installation.

What leveraging actually requires

Leveraging is not a shortcut you can decide on retrospectively. For commissioning evidence to carry into qualification, all of the following have to be true:

1. The approach was approved in advance by the quality unit, normally in the CQV Master Plan.
2. The work was executed under good engineering practice — controlled documents, defined acceptance criteria, recorded raw data.
3. Instruments were calibrated against traceable standards at the time of the test, with records available.
4. Executors were trained and their competence documented.
5. The documentation is retrievable and under document control, not sitting in a contractor’s project folder.
6. Changes since the test are assessed — a system modified after commissioning may need re-verification.

Fail any one of those and the evidence does not transfer. This is the most common finding on projects that adopted a risk-based approach in principle without putting the controls behind it.

The practical failure mode

The pattern repeats across projects: a team decides to “follow E2500,” commissioning runs fast and loose because “validation will cover it,” and then validation discovers the commissioning records are uncontrolled, the instruments were not calibrated, and nothing can be leveraged. The programme reverts to full traditional qualification, late, at the point in the schedule where there is no time for it.

Risk-based C&Q is not less rigorous than the traditional approach. It concentrates rigour where it changes the outcome, and it demands more discipline in commissioning, not less — because commissioning evidence now has to stand up to regulatory scrutiny rather than just engineering scrutiny.

Getting the distinction right on your project

Decide three things early, and write them down:

• Which systems have GMP impact, on a documented, risk-assessed basis — not by intuition and not by qualifying everything.
• What will be leveraged, and under what conditions, approved by the quality unit before commissioning starts.
• Who signs what — because the division of approval authority between subject matter experts and the quality unit is the part that most often goes undefined.

Get those into the CQV Master Plan and the distinction stops being semantic. Leave them out and the two words stay interchangeable right up until an inspector asks which one you did.