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what is the major difference quality control and quality assurance?

i want to know the skills needed for QC and QA..........

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Quality Assurance
1. A set of activities designed to ensure that the development and/or maintenance process is adequate to ensure a system will meet its objectives.
2. QA activities ensure that the process is defined and appropriate. Methodology and standards development are examples of QA activities. A QA review would focus on the process elements of a project - e.g., are requirements being defined at the proper level of detail.
3. Quality Assurance makes sure you are doing the right things, the right way.

Quality Control
1. A set of activities designed to evaluate a developed work product.
2. QC activities focus on finding defects in specific deliverables - e.g., are the defined requirements the right requirements
3. Quality Control makes sure the results of what you've done are what you expected
THANKS MA..........

but what are the skills needed to be a specialist in QA or Qc ?
The briefest difference is that Quality assurance includes Quality Control but vice a versa is not true.
That means Quality control is a branch of Quality assurance.
___- JAY _____
Quality Assurance: A planned and systematic pattern of all actions necessary to provide adequate
confidence that an item or product conformsto established technical
requirements.
OR
Quality Assurance is a set of activities designed to evaluate the process by
which products are developed or manufactured.

Quality Control: In Software Engineering this term has no standardised meaning.
However an authentic but non standardised definition or meanings generated
are as follows.
(1) a set of activities designed to evaluate the quality of developed or
manufactured products.
(2) The process of verifying one's own work or that of a co-worker.

_______ JAY _________
Quality Assurance makes sure you are doing the right things, the right way.

Quality Control makes sure the results of what you've done are what you expected.
QA: That keeps monitoring for the continuous Process Improvement. QA verifies weather we are buildilg the right system whereas the Quality control validates weather we built the system right.
From QA we can assure that more than 60% of the defects can be identified. But through QC its very hard to identify more than 30%.
QA job is to prevent the defect before occuring.
QC job detecting the defects by breaking the code /appliction.i.e nothing but Testing or Validating the app.

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