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spiral model
subject			fact

spiral model	has definition An incremental process model that explicitly embraces prototyping and an iterative approach to software development
	follows principles: prototyping iteration risk analysis the idea that maintenance is simply a type of on-going development
	has steps a project undergoes a large number of cycles, starting with a small prototype each loop of the spiral follows a mini-waterfall process before each cycle of the spiral ends, a review is held subsequent cycles become official releases the cycling only ends when the system is finally retired
	is a subtopic of 11.2 - Software Process Models
	is a kind of process model
	suggests that the first thing to do before embarking on each new loop of the spiral is to decide what are the major difficulties to be handled
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