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As you can see, it incorporates those four key steps again:
Discover, Design, Develop, Test
But with a twist. It allows (or even requires) a loopback
after testing, so you can refine a process before moving
on to whatever is considered the desired final result.
This iterative process gives the Agile method a definite edge in certain
types of development process, mostly regarding the level of risk at the
end, and the level of preparedness at any step prior to completion.