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evolutionary model
subject			fact

evolutionary model	has definition A process model that views development as a series of hills, each representing a separate loop of the spiral model
	is a subtopic of 11.2 - Software Process Models
	is a kind of process model
	represents software development as a series of hills, each representing a separate loop of the spiral
	shows that loops, or releases, tend to overlap each other: As testing and preparations for deployment of one release are underway, planning for the next release has already started development work tends to reach a peak, at around the time of the deadline for completion of implementation each prototype or release can take different amounts of time to deliver, and can take differing amounts of effort
process model	functions as an aid to thinking, not as a rigid prescription of the way to do things
	helps the project manager and his or her team to decide what work should be done and in what sequence to perform the work