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.

This article relies excessively on references to primary sources. (February 2017)

Software development
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Core activities Processes Requirements Design Construction Engineering Testing Debugging Deployment Maintenance
Paradigms and models Software engineering Agile Cleanroom Incremental Prototyping Spiral V model Waterfall
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