Explain the Spiral Model. Compare and contrast it with the sequential model.

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teamques10 ★ 68k

Spiral Model is a combination of a waterfall model and iterative model. Each phase in spiral model begins with a design goal and ends with the client reviewing the progress. The spiral model was first mentioned by Barry Boehm in his 1986 paper. The development team in Spiral - SDLC model starts with a small set of requirement and goes through each development phase for those set of requirements. The development team adds functionality for the additional requirement in every-increasing spirals until the application is ready for the production phase.

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When to use Spiral Model?

When project is large

When releases are required to be frequent

When creation of a prototype is applicable

When risk and costs evaluation is important

For medium to high-risk projects

When requirements are unclear and complex

When changes may require at any time

When long term project commitment is not feasible due to changes in economic priorities

Advantages and Disadvantages of Spiral Model

Advantages	Disadvantages
Additional functionality or changes can be done at a later stage	Risk of not meeting the schedule or budget
Cost estimation becomes easy as the prototype building is done in small fragments	It works best for large projects only also demands risk assessment expertise

Model	Water-Fall Model	Incremental Model	Spiral Model	Rad Model
Planning in early stage	Yes	Yes	Yes	No
Returning to an earlier phase	No	Yes	Yes	Yes
Handle Large-Project	Not Appropriate	Not Appropriate	Appropriate	Not Appropriate
Detailed Documentation	Necessary	Yes but not much	Yes	Limited
Cost	Low	Low	Expensive	Low
Requirement Specifications	Beginning	Beginning	Beginning	Time boxed release
Flexibility to change	Difficult	Easy	Easy	Easy
User Involvement	Only at beginning	Intermediate	High	Only at the beginning
Maintenance	Least	Promotes Maintainability	Typical

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