<testing> (QA) A planned and systematic pattern of all actions necessary
to provide adequate confidence that the product optimally fulfils customers'
expectations, i.e. that it is problem-free and well able to perform the task it
was designed for.
The QA of a commercial product usually involves alpha testing, where an early
version of the product is tested at the developer's site, and is then improved
accordingly. Then, an almost complete version of the product is made available
for beta testing by (selected) real users. Faults identified during beta testing
should be fixed before the product is released for full scale manufacturing and
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