This is a type of testing that is performed within the development organization with the possible partial involvement of end-users. It can be a form of internal acceptance testing.
What is the point of Alpha Testing?
The product can already be shown to external users, but it is still quite "raw," so the main testing is done by the development organization.
This type of testing is performed outside the development organization with the active involvement of end-users or the customer. It can be a form of external acceptance testing.
What is the point of Beta Testing?
The product can be openly shown to external users, it is already stable enough. But there can still be problems, and feedback is needed from real users to identify them. As an example, the bugs that users find during Beta Testing of computer games.
This type of pre-release testing is aimed at correcting minor defects found in Beta Testing. As a rule, it is performed with maximum involvement of end-users or the customer. It can also be a form of external acceptance testing.
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