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Spiral model (Boehm, 1988). A number of misconceptions stem from oversimplifications in this widely circulated diagram (there are some errors in this diagram).^[1]

Software development
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The spiral model is a risk-driven software development process model. Based on the unique risk patterns of a given project, the spiral model guides a team to adopt elements of one or more process models, such as incremental, waterfall, or evolutionary prototyping.

^ Boehm, B (July 2000). "Spiral Development: Experience, Principles, and Refinements" (PDF). Special Report. Software Engineering Institute. CMU/SEI-2000-SR-008.