Spiral model

Spiral Model
What is Spiral Model?
Phases
When to use Spiral Model?
Advantages and Disadvantages
Conclusion

1. Spiral Model Presented by – Phyu Sin tun 1

2. Contents What is Spiral Model? Phases When to use Spiral Model? Advantages and Disadvantages Conclusion 2

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. 3

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). 4

5. Four Phases of Spiral model Planning Risk Analysis Engineering Evolution 5

6. Phases 6

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 . 7

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. 8

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. 9

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. 10

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 . 11

12. When to use spiral model? When changes may require at any time. Customer is not sure of their requirements which is usually the case . New product line which should be released in phases to get enough customer feedback. Significant changes are expected in the product during the development cycle . 12

13. 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 . 13

14. 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 . 14

15. 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. 15

16. Thank You! 16