Spiral Model
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The spiral model combines elements of the prototype and waterfall models. It involves iterating through phases of planning, risk analysis, engineering, and customer evaluation. The model aims to identify and mitigate risks early through prototyping. Key advantages include risk avoidance and the ability to add functionality later, though it can be costly due to extensive risk analysis needs.
Spiral Model
- 1. SPIRAL MODEL (SDLC) Inam Ul-Haq Lecturer in Computer Science University of Education, Okara Campus [email protected] Submitted by: Hira Mehar Roll No. 3006 BS-IT-Eve IV Semester UniversityofEducationOkara Campus 1
- 2. Introduction In this system development method, we combine the features of both, prototype model and waterfall model. UniversityofEducationOkara Campus 2
- 3. Introduction •In spiral model we can arrange all the activities in the form of a spiral •A spiral model is divided into number of framework activities, called task regions •Typically, there are between three and six task regions UniversityofEducationOkara Campus 3
- 4. Why Spiral Model ??? 4 UniversityofEducationOkara Campus
- 5. Why Spiral Model ??? 5 UniversityofEducationOkara Campus
- 6. Why Spiral Model ??? 6 UniversityofEducationOkara Campus
- 7. History •The spiral model was defined by Barry Boehm in his 1988 article. •This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters. 7 UniversityofEducationOkara Campus
- 9. Phases •Customer Communication •Planning •Risk Analysis •Engineering •Customer Evaluation 9 UniversityofEducationOkara Campus
- 10. Customer Communication •Includes understanding the system requirements by continuous communication between the customer and the system analyst. 10 UniversityofEducationOkara Campus
- 11. Planning • Task required to define resources, timelines and other project related information 11 UniversityofEducationOkara Campus
- 12. Risk Analysis • In the risk analysis phase, a process is undertaken to identify risk and alternate solutions. 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. 12 UniversityofEducationOkara Campus
- 13. Engineering •In this phase software is developed, along with testing at the end of the phase. Hence in this phase the development and testing is done 13 UniversityofEducationOkara Campus
- 14. Customer Evaluation • This phase allows the customer to evaluate the output of the project to date before the project continues to the next spiral 14 UniversityofEducationOkara Campus
- 15. Advantages High amount of risk analysis hence, avoidance of risk is enhanced. UniversityofEducationOkara Campus 15
- 16. Advantages Good for mission critical projects. UniversityofEducationOkara Campus 16
- 17. Advantages Strong approval and documentation control. UniversityofEducationOkara Campus 17
- 18. Advantages Additional functionality can be added at a later date. UniversityofEducationOkara Campus 18
- 19. Disadvantages Can be costly model to use. UniversityofEducationOkara Campus 19
- 20. Disadvantages Risk analysis requires highly specific expertise. UniversityofEducationOkara Campus 20
- 21. Disadvantages Project`s success is highly dependent on the risk analysis phase. UniversityofEducationOkara Campus 21
- 22. Strengths • Provides early indication of insurmountable risks, without much cost • Users see the system early because of rapid prototyping tools • Critical high-risk functions are developed first • The design does not have to be perfect • Users can be closely tied to all lifecycle steps • Early and frequent feedback from users 22 UniversityofEducationOkara Campus
- 23. Conclusions • The risk-driven nature provides adaptability for a full range of software projects. • The model has been successful in a large application, the TRW-SPS. • The model is not yet fully elaborated. • Even partial implementations of the model, such as the risk management plan, are compatible with the other process models. 23 UniversityofEducationOkara Campus
- 24. References • www.slideshare.net • www.buzzle.com • www.cavehill.uwi.edu 24 UniversityofEducationOkara Campus