**ALSO CALLED:**
Spiral Model
**DEFINITION:** The spiral model, also known as the spiral lifecycle model, is a systems development lifecycle (SDLC) model used in information technology (IT). This model of development combines the features of the prototyping model and the waterfall model. The spiral model is favored for large, expensive, and complicated projects.The steps in the spiral model can be generalized as follows: The new system requirements
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