by Renaud Anjoran in 'Quality Inspection Blog'
I often have to explain what the difference between quality assurance (QA) and quality control (QC) is. The best is for me to write an article about it, and I’ll point people to it in the future.
Here is a short version:
QA = all the activities that aim at ensuring a certain level of quality. It includes defining what the requirement are + setting up a proper management system + QC.
QC = only the activities that consist of checking whether conformity is achieved or not. In the context of an importer who needs to secure his product quality, QC means checking if the specs are respected in production, and it translates into 2 types of activities: on-site inspections (statistical quality control) & laboratory testing (only on a few samples taken out of bulk production).
Here is the more detailed version:
1. Good QA takes time but is worth it
For an importer buying finished products from low-cost Asia, QA includes the following steps:
2. QC is part of QA
It is important to understand that QA includes QC. It is not “either QA or QC”. Good QA is dependent on QC, since the information from inspection is necessary to implement corrective and preventive measures.
The old way: inspect bad quality out; The new way: build quality in.
- W. Edward Deming
3. QA is constantly mixed up with QC
“QA” and “QC” are often used interchangeably. “QA” sound smarter than “QC”, so QA is frequently substituted to QC. I have met with “QA technicians” who actually do statistical quality control every day.
Have I left anything important out of this article?