Definition
The process of reconfirming that previously qualified equipment, a system or infrastructure continues to meet requirements after time, change or a significant event.
Human Explanation
It checks whether qualified assets remain in the required state.
Why it Matters
Wear, modification and other changes can affect continued conformity.
Conceptual Boundary
Requalification does not always require repeating every DQ-to-PQ activity; scope should follow risk and the nature of change.
Practical Perspective
It may be scheduled periodically or triggered by significant technical, process or maintenance changes.