QC Vs QA

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Quality Control

QC means identifying defects by inspection and testing of finished products or services

Quality control is a product based approach

Quality control is used to verify the quality of the product

QC is performed only after product produced

It is a reactive approach and helps you find defects in deliverables.

Seven basic tools of quality are scatter diagram, control chart, histogram, checklist, Pareto diagram,
 cause and effect analysis, and flow chart. These tools help you find defects and improvef the product.

Quality Assurance

QA is a way of preventing mistakes and defects in manufactured products 
and avoiding problems when delivering services to customers; which ISO 9000 defines as
 "part of quality management focused on providing confidence that quality requirements will be fulfilled

QA means preventing defects and provide assurance that quality requirements will be fulfilled

QA focuses on improving the processes to deliver Quality Products to the customer

QA is focused on planning, documenting, quality audit, process analysis  
that are necessary to assure quality.

QA is a proactive management practice that is used to assure a stated level of quality

The Difference Between Quality Assurance and Quality Control

Comparision	Quality Assurance	Quality Control
Definition	QA means defect prevention and QA  provide assurance that quality  requirements will be fulfilled.	QC means identifying defects by  inspection and testing of finished good or services
Focus on	QA focuses on improving the  processes to deliver Quality Products  to the customer	QA focuses on the product verification to  deliver Quality Products to the customer
How	Prevention of quality problems through  planning, documenting, quality audit,  process analysis that are necessary  to assure quality.	Finding & eliminating sources of quality  problems through tools so that customer's  requirements are continually met.
Responsibility	Everyone on the team involved in  developing the product is responsible  for quality assurance.	Quality control is usually the responsibility of a specific team that tests the product for defects.
Orientation	QA is process oriented	QC is product oriented
Technique	It's a Preventive technique QA	It's a Corrective technique QC
Statistical Techniques	Statistical technique applied on QA is  known as SPC or Statistical Process  Control (SPC)	Statistical technique applied on QC is known as SQC  or Statistical Quality Control
Creation of quality	Designing stage	Control stage
	It is performed before Quality Control	It is performed only after QA activity is done

Conclusion

Nowadays people are becoming quality sensitive, and that is why they do not want to compromise
 with the product which is lower quality. Quality Assurance and Quality Control are the two tools 
which help to provide quality products to the users.

Key Points

• In QA, processes are planned to prevent the defects.
• QC identify  the defects and correct them while making the product.
• QA prevent defect.
• QC identify defects.
• QA is process oriented
• QC is product oriented.
• QA is defect prevention system.
• QC is defect detection system