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The Business Case for Spiral Development in Heavy - NTRS - NASA

The Business Case for Spiral Development in Heavy - NTRS - NASA 2025

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The document titled 'Spiral Development: Experience, Principles, and Refinements' discusses the spiral development model in software engineering, emphasizing its iterative nature and risk management. It outlines six invariant properties essential for successful implementation of the model, along with their variants and examples of hazardous look-alike models that lack these invariants. The report also introduces anchor point milestones (Life Cycle Objectives, Life Cycle Architecture, Initial Operational Capability) as critical checkpoints to ensure stakeholder commitment and project progress. Overall, it serves as a foundational characterization of the spiral development model to distinguish it from other process models.

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