Software Testing - QA, QC & Testing

Quality Assurance:

QA includes activities that ensure the implementation of processes, procedures and standards in context to verification of developed software and intended requirements.
Focuses on processes and procedures rather than conducting actual testing on the system.
It is a subset of Software Test Life Cycle (STLC).

Quality Control:

It includes activities that ensure the verification of a developed software with respect to documented (or not in some cases) requirements.
Focuses on actual testing by executing the software with an aim to identify bug/defect through implementation of procedures and process.
QC can be considered as the subset of Quality Assurance.

Testing:

It includes activities that ensure the identification of bugs/error/defects in a software.
Focuses on actual testing.
Testing is the subset of Quality Control.

References: https://www.tutorialspoint.com/software_testing/software_testing_qa_qc_testing.htm

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