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Boehm's Spiral Model — Four Sectors

publish date: 2026/06/02 10:22:15.731817 UTC

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The diagram below shows the four sectors of each loop in Boehm's spiral model.

1. Objective Setting Define objectives & identify risks 2. Risk Assessment & Reduction 3. Development & Validation Model chosen based on risk 4. Planning Review & continue? Each loop = one phase of the software process


What is the key feature that distinguishes the spiral model from other software process models?

Correct Answer

It explicitly recognises risk and includes risk management activities to reduce those risks in every phase

Explanation

The main difference between the spiral model and other process models is its explicit recognition of risk. The model assumes changes are a result of project risks and includes explicit risk management activities to reduce these risks in every loop.

Reference

Software Engineering, Ian Sommerville, 9th edition

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