History
This model was defined by Barry Boehm in his 1986 article "A Spiral Model of Software Development and Enhancement". It was not the first model to discuss iterative development.
As originally envisioned, the iterations were typically 6 months to 2 years long. Each phase starts with a design goal and ends with the client (who may be internal) reviewing the progress thus far. Analysis and engineering efforts are applied at each phase of the project, with an eye toward the end goal of the project.
Read more about this topic: Spiral Model
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