Alpha Testing is primarily as usability testing is done by internal developers who developed the application or the testers. Sometimes this alpha check is done by the customer or a person outside the presence of developers and tester. The version after version is called alpha testing alpha release.
Gamma check is performed when the application is ready for release to the specified requirements, this check is performed directly without going through all the testing activities at home
Beta Testing is done for limited number of finish users before delivery, the change request is set if the user provides information or reports of defects. The release after beta testing is called beta.
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