Definition
The process of confirming that equipment or a system consistently achieves required results during routine use for its intended purpose.
Human Explanation
PQ asks whether the equipment fulfils its function during normal work.
Why it Matters
Routine conditions reveal whether the solution produces the expected practical result.
Conceptual Boundary
PQ supports equipment readiness but does not replace Validation of the complete process.
Practical Perspective
Evaluation uses representative operating conditions, process parameters, materials and defined evidence.