Organization can have in-house inspection, direct involvement of users and release of beta version are few of them and it also includes usability, compatibility, user acceptance etc, is called ___?

Organization can have in-house inspection, direct involvement of users and release of beta version are few of them and it also includes usability, compatibility, user acceptance etc, is called ___?
Testing
Explanation: None
Task Analysis
GUI Requirement Gathering
GUI design & Implementation
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