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What,in simple words ,is the difference between QC and QA?

Like "Love", Quality is another most used but lesser understood word. One of the reasons behind it ,is sometimes a confusing term or definition. An example is the difference between QA and QC. Just see below the definitions of Quality, QC and QA as defined by ISO. To the new entrants it may appear just inexplicable. I think It would be beneficial ,if some easily understood definition is provided here.

By ISO:

QUALITY – Degree to which a set of inherent characteristics fulfils requirements [ISO9000:2005 -3.1.1]. QUALITY ASSURANCE – Part of quality management focused on providing confidence that quality requirements will be fulfilled [ISO9000:2005 -3.2.11]. QUALITY CONTROL – Part of quality management focused on fulfilling quality requirements [ISO9000:2005 -3.2.10].  [ISO9000:2005 -3.2.12] QUALITY ASSURNACE SYSTEM (QAS) – A management system to direct and control SLPS with regard to quality

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Question added by zubair.tahir Mohammad Zubair Tahir , G.M. Quality & Development , Union Industries (Pvt) Ltd.B-46,S.I.T.E,Karachi
Date Posted: 2015/01/29

Quality control- Measures taken to maintain well functioning of fleet , maintenance, scheduling and production line etc

Quality Assurance - Ensuring all the measures are well done , no violation of any laws and identify flaws in any departments and also products 

ajay  kumar
by ajay kumar , Project Head , THE HERMITAGE PARK

Quality Assurance is process oriented and focuses on defect prevention, while quality control is product oriented and focuses on defect identification.

Asham Al Masri CIA CMA CFE CRMA CCSA
by Asham Al Masri CIA CMA CFE CRMA CCSA , Internal Audit Manager , Fadaat Media

QC is responsible for checking Controls are in place during the processing phase, while QA is responsible for checking the output  (after the process is complete) and ensure it is as required in terms of quality.

intikhab ali
by intikhab ali , QA/QC Manager , China Geo Engineering Corporation Saudi Branch

QA/QC is the combination of quality assurance

The difference between QA and QC is very simple.

QA mean Quality assurance QA will prevent defects with a focus on the process used to make the product. It is a proactive quality process. 

QC mean Quality control QC  identify defects (and correct)  in the finished product.

Eze Emmanuel Chinedu
by Eze Emmanuel Chinedu , Quality Assurance/ Quality Control Engineer , Standard Metallurgical Company, Sagamu - Lagos

QC is product oriented while QA is Process oriented: that is, QA ensures a capable process for achieving a quality product

DENNIS ALEJANDRO
by DENNIS ALEJANDRO , Project , KING ABDULLAH SPORTS CITY ( Sports Hall and

QAULITY CONTROL- The process for inspections for all activity and to stop and give immediate notifications/report for any works that are non-confirming.

QAULITY ASSURANCE- Ensuring projects are in compliance with policies and standards to meet all required guidelines & regulations. all aspects related to quality control are planned, resourced, performed, controlled, managed and documented. 

Kevin McCarthy
by Kevin McCarthy , Proposals Engineer , WTS Broadcast Systems

QC produces work to an agreed quality standard,

QA confirms that the standard has been observed.

Robin Pallickal
by Robin Pallickal , Electrical Engineer , Gulf Dredging & General Contracting Co. KSC

Quality assurance consists of that “part of quality management focused on providing confidence that quality requirements will be fulfilled.” The confidence provided by quality assurance is twofold—internally to management and externally to customers, government agencies, regulators, certifiers, and third parties. Quality control is that “part of quality management focused on fulfilling quality requirements.” While quality assurance relates to how a process is performed or how a product is made, quality control is more the inspection aspect of quality management.

Joseph Fernandez
by Joseph Fernandez , Field Engineer , Al Jaber Energy Services

quality of site work perform by skilled workers

QA is quality checking during process in line and QC is quality checking/testing after finish product.

Abdulrahman Suleiman
by Abdulrahman Suleiman , Administration , Taraba Microfinance Bank (Nig) Ltd, No

QC is quality control while QA is quality asurance

Quality control is measures put in place to ensure that standard set is what is prfoduced while Quality assurance is confirmation that what is required will be produced.

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