Testing process involves in a company depends on the type of
the company but the testing process we are following in
every company is same as follows:

-->Preparing test scenarios from the given SRS document 
-->Preparing Test cases from the prepared test scenarios
-->Executing test cases on the software build to get the
bugs present in the build
-->Identifying the bugs and posting them to corresponding
-->Then conducting retesting for the fixed defects 
-->If all the fixed defects then we have to conduct
Regression testing to identify any bugs fixing effected the
build
-->then conduct UAT testing to get the confidence of the
stable build for its correctness and completeness

these are all the possible steps to follow when we are
conducting testing process in any company

If it is maintainable project even  after releasing the
project we need to test it again if any bugs came and when
they got fixed..

Regads
Somu