i) Parallel running
? This is where on the existing and the new system are run con-currently/ simultaneously/ at the same time for period of time until users have gained confidence in the new system in one bold move. The existing system is stopped and abandoned and the new system starts operating immediately.
ii) Direct change over
? This is a complete replacement of the existing system with the new system in one bold move. The existing system is stopped and abandoned and the new system starts operating immediately.
Musyoxx answered the question on March 1, 2018 at 17:48
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