Quality Assurance vs Quality Control: What’s the Difference?

In this video, Brian Wagner, PE talks about the difference between Quality Assurance (QA) and Quality Control (QC) and the role quality management plays in both QA & QC. #qualitycontrol #qualityassurance #qa #qc

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[DannyKahler-PE]

These definitions are all over the place depending on where you were. Is the person testing or inspecting "controlling" anything in the finished product, or are they measuring it? Is the person creating the product "assuring" it, or are they the ones really in control of it's quality? Even the FHWA and FTA can't agree on what they mean. A better approach is to use the more modern ASQ definitions tied to the cost of quality. Prevention (or process control) are the things that prevent defects in a product in the first place. This includes knowing the requirements, having a process that can meet those requirements, and keeping the process in control. Appraisal (or verification and acceptance) tests, inspects, and otherwise measures the produced work to see whether or not it meets requirements. So prevention (a necessary cost) has to go into every piece of work, but appraisal could be statistically estimated (also a necessary cost vs 100% inspection and testing which is usually an unnecessary cost unless you're managing nuclear warheads, going into space, or bolting doors into a Boeing aircraft). Defective work that is caught in appraisal is an internal failure, since it requires rework but the customer never sees it. Defective work that is not caught in appraisal is external failure and can often end up on the six oclock news like some bridge projects. Whether it's internal or external might depend on your point of view. Just as prevention and appraisal might depend on your point of view. If someone else produces work and you appraise it, you were not in control of that work, but you might be in control of whether or not that work is accepted and incorporated into other work.

[J.Braxton]

Really appreciate your breakdown, especially at 14:15. The definitions in a vacuum seem to make more sense for the way your old company used them.

[mohammadsaeed]

I agree with ISO definition. Controls means that something is already existing, and we are only controlling it . That something to me is QA . So, Quality requirements give rise to QA and then QC. Making QC as QA is not right.

[MrBulent]

Im glad I found this channel. Very helpful

[JamesBond-fzdu]

What is the difference between quality management and quality engineering ??