A brief description about spiral model inn software development engineering.

1. Spiral Model
Presented by – YASH PRASHANT PUROHIT
20MIS0364
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2. Contents
• What is Spiral Model?
• Phases
• When to use Spiral Model?
• Advantages and Disadvantages
• Conclusion
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3. What is spiral model?
• Spiral model is one of the most important Software Development
Life Cycle models, which provides support for Risk Handling.
• Spiral Model is a combination of a waterfall model and prototype
model.
• Each phase in spiral model begins with a design goal and ends with
the client reviewing the progress.
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4. • The spiral model was first mentioned by Barry Boehm in his 1986 paper.
• The spiral model is similar to the incremental model, with more emphasis
placed on risk analysis.
• The spiral model has four phases: Planning, Risk Analysis, Engineering
and Evaluation.
• Software project repeatedly passes through these four phases in iterations
(called Spirals).
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5. Four Phases of Spiral model
• Planning
• Risk Analysis
• Engineering
• Evolution
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6. Phases
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7. Planning
• This phase starts with gathering the
business requirements in the baseline
spiral.
• In this phase, Software Analyst
communicate with the clients and the
necessary requirements such as
Business requirements and System
requirements are gathered.
• Planning includes estimating the cost,
schedule and resources for the iteration.
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8. Risk Analysis
• In this phase analyst assume all
the possible risks that could be
occurred during future
development.
• A prototype is produced at the end
of the risk analysis phase.
• If any risk is found during the risk
analysis then alternate solutions
are suggested and implemented.
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9. Engineering
• In this phase software is
developed, along with
testing at the end of the
phase.
• Hence this phase includes
testing, coding and
deploying software at the
customer site.
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10. Evaluation
• In this phase, Customers
evaluate the so far
developed version of the
software.
• In the end, planning for the
next phase is started.
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11. When to use spiral model?
• When project is large
• Where the software needs continuous risk evaluation.
• When risk and costs evaluation is important
• For medium to high-risk projects
• When requirements are unclear and complex.
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12. Advantages of Spiral model
• Additional functionality or changes can be done at a later stage.
• Cost estimation becomes easy as the prototype building is done in
small fragments.
• Continuous or repeated development helps in risk management.
• Development is fast and features are added in a systematic way.
• There is always a space for customer feedback and the changes are
implemented faster.
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13. Disadvantages of Spiral model
• Risk of not meeting the schedule or budget.
• It works best for large projects only also demands risk
assessment expertise.
• For its smooth operation spiral model protocol needs to be
followed strictly.
• Documentation is more as it has intermediate phases.
• It is not advisable for smaller project, it might cost them a lot.
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14. Conclusion
• Each spiral can be termed as a loop and each loop is a separate
development process in a spiral model.
• This model is very good to use for larger projects where you can
develop and deliver smaller prototypes and can enhance it to make
the larger software.
• The implementation of this model requires experienced resources as
risk analysis is a very integral part of this model and risk analysis
requires expertise and as a result this model becomes costly.
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15. Thank You!
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