Relationship of TQM, QA, QS and QC

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The discussion centers on clarifying the relationships between Total Quality Management (TQM), Quality Assurance (QA), Quality Control (QC), and Quality Systems (QS). It is established that QA and QC are distinct yet interconnected, with QC being a subset of QA. QA encompasses the processes that ensure testing protocols are effective and that the personnel conducting tests are qualified. TQM is viewed as a broader management philosophy that includes both QA and QC as essential components. QS refers to structured frameworks like GMP, GLP, and ISO 9000 that support quality assurance efforts. The diagram in question visually represents these hierarchical relationships, indicating that TQM is the overarching concept that includes both QA and QC, with QS serving as a foundational element within this structure.
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In this diagram:
http://img692.imageshack.us/img692/3012/tqmo.png
what exactly are they trying to convey as in, what is the relationship between TQM, QA, QS and QC? Does each outer circle encapsulate all the inner circles? For example, it QA a part of TQM, while QS is a part of QA etc.? I thought that QA and QC were 2 different things, I didn't think QC was just a subcategory of QA.
 
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No idea what QS stands for here, but in the way of examples (at least as I understand the terms - if it's still not clear, I really can't be of much more help - maybe go bug the industrial engineers or MBAs?)...

Quality Control - random batch testing of a product to ensure that it does what it is intended to do.

Quality Assurance - makes sure that the testing protocols are up to date and followed, checks qualifications and records of the QC division staff (so as to check that they are knowledgeable and capable to do the testing), and the like

Total Quality Management - some sort of business management philosophy that I've never entirely cared enough to figure out what they mean. :)
 
Sorry, QS stands for quality system. According to my lecture notes, things like GMP, GLP and ISO 9000 are quality systems. Thanks a lot for your reply, I've read about 20 explanations of what QA and QC are and I'm still confused as hell about it all. Your practical, straight to the point explanations make way more sense to me.
 
Just interpret your diagram in terms of subset/superset terms. ie. QC is a subset of QA and both are subsets of TQM.
 

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