QA stands Quality Assurance. QA is a set of activities designed to ensure that the developed software meets all the specifications or requirements mentioned in the SRS document.

QA follows the :

Plan
The plan is a phase in Quality Assurance in which the organization determines the processes which are required to build a high-quality software product.

Do
Do is a phase of development and testing the processes.

Check
This phase is used for monitoring the processes and verifies whether these processes meet the user requirements or not.

Act
The Act is a phase for implementing the actions required to improve the processes.