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Software Engineering - Spiral Model
- 1. AGUILAR, FATIMA JOY D. ARPON, BENEDICT JULIUS STEVE
- 2. SPIRAL MODEL Spiral Model is an evolutionary software process model which is combination of an iterative nature of prototyping and systematic aspects of traditional waterfall model Spiral model can be adapt to apply throughout the life of computer software. In spiral model, we can easily adjust easily software development with the required changes.
- 4. BARRY BOEHM born on 1935. In America Software Engineer, Distinguished Professor At the University of Southern California.
- 5. When to use Spiral Model When costs and risk evaluation is important For medium to high-risk projects Users are unsure of their needs Requirements are complex Significant changes are expected
- 6. Four fold procedure 1. Evaluating the first prototype in terms of its strengths, weaknesses, risk. 2. Defining the requirements of the second prototype 3. Planning and designing the second prototype. 4. Constructing and testing the second prototype EVALUATING NGCONSTRUCTING / TESTING PLANNING / DESIGNING DEFINING
- 7. Phase in spiral model
- 8. The Spiral has Four Phases: PLANNING Requirements are gathered during the planning phase. RISK ANALYSIS a process is undertaken to identify risk and alternate solutions. EVALUATION This phase allows the customer to evaluate the output of the project ENGINEERING In this phase software is developed, along with testing at the end of the phase.
- 9. Advantages of Spiral Model High amount of risk analysis hence, avoidance of Risk is enhanced. Good for large and mission – critical projects. Strong approval and documentation control. Additional Functionality can be added at later date. Software is produced early in the software life cycle.
- 10. Disadvantages of Spiral Model Can be a costly model to use. Risk analysis requires highly specific expertise. Projects success is highly dependent on the risk analysis phase. Doesn’t work well for smaller projects.
- 11. WATERFALL VS. SPIRAL MODEL The sequential nature of the waterfall model if a bug is found or an error is incurred for a preliminary reason, we need to start from the scratch again Waterfall model the stages are executed under a sequential flow. Every new phase is processed only after completing the previous phase. Whereas, under spiral model every prototype is tried and tested and hence the chances of find errors at later stages are very rare. In spiral model, we can easily adjust software development with the required changes.
- 12. AGILE VS. SPIRAL MODEL Agile development includes a number of different methodologies w/ specific guidance as to the steps to take to produce a software project such as Extreme programming. Scrum and Crystal Clear. In spiral model, we can easily adjust software development with the required changes.
- 13. INCREMENTAL VS. SPIRAL MODEL Incremental Development is a practice where the system functionalities are sliced into increments(small portions). A software project repeatedly passes through these phases in iteration( called spiral in this model). The baseline spiral, staring in the planning phase, requirements are gathered and risk is assessed.
- 14. PROTOTYPE VS. SPIRAL MODEL Prototype model is suitable when the requirement of the client is not clear and it is supposed to be changed. Spiral model is called a meta model. Spiral model is made with the features of Prototype model and Waterfall model. Spiral model takes special care about Risk analysis.
- 15. CONCLUSION Each Spiral can be termed as a loop and each loop is a separate development process in a Spiral Model. The Four activities ( Planning, Risk analysis, Engineering and Evaluating) form the intermediary phases of Spiral model and is repeated again for each loop. 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.