What is Quality Control (QC)?
The process of inspecting and testing products or services to ensure they meet defined quality standards.
Detailed Explanation
Quality control is a reactive, product-oriented approach that focuses on identifying defects in finished or in-progress work. QC activities include inspections, testing, sampling, and measurements against defined acceptance criteria. While quality assurance aims to prevent defects, quality control aims to detect them before they reach the customer. Effective QC requires clear quality standards, trained inspectors, calibrated measurement tools, and well-documented procedures for handling non-conformances when they are found.
Why It Matters
Quality control is your last line of defence before work reaches the customer. Even with strong quality assurance processes, QC catches the inevitable exceptions and variations that occur in real-world operations. Consistent QC also generates data that feeds back into quality assurance improvements.
Example
A commercial painting contractor implements QC checkpoints at three stages: after surface preparation, after the first coat, and after the final coat. Each checkpoint uses a standardised checklist covering coverage, finish quality, and edge lines. Issues caught early are far cheaper to fix than discovering them at final handover.
Related Terms
A systematic approach to preventing defects by focusing on the processes used to create products or services.
A deviation from a specified requirement, standard, or procedure that indicates something has not met the defined quality expectations.
The percentage of units or tasks completed correctly the first time without requiring rework, repair, or correction.
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