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Tell me exact definition

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The goals of both are different: The goal of QA is to prevent the errors in the program. The goal of testing is to find the errors.
The most brief difference is QA includes testing but vice a versa is not true.
____ JAY _____
QA is responsible 4 monitoring and improving entire S.D.L.C phases nothing but preventing the bug
testing is finding bug.

Testing examining the behaviour of the application by executing on sample data sets.
QA is more a preventive thing, ensuring quality in the company and therefore the product rather than just testing the product for software bugs

TESTING means "quality control"
QUALITY CONTROL measures the quality of a product
QUALITY ASSURANCE measures the quality of processes used to create a
quality product.
Quality Assurance: A planned and systematic pattern of actions necessary to provide adequate confidence that the product optimally fulfills customers' expectations.
Testing:between expected and actual behavior.
____ JAY ____
Definition of Software Quality as defined at NASA (National Aeronautics and Space Administration
at USA) is like:
The function of software quality that assures that the standards, processes, and procedures are appropriate for the project and are correctly implemented.

The difference in QA and Testing can also be stated as under:
Testing involves operation of a system or application under controlled conditions and evaluating the results. It is oriented to 'detection'.

Software QA involves the entire software development process - monitoring and improving the process, making sure that any agreed-upon standards and procedures are followed, and ensuring that problems are found and dealt with. It is oriented to 'prevention'.

Therefore, Remember major shift in QA is PREVENTION of a great killer- BUG rather than to DETECTION of a BUG.
_____ JAY _____

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