Spiral Model : Spiral model is risk driven software development process model. Based on unique risk management pattern. The spiral model guides a team to adapt elements of one or more process model such as waterfall, incremental, prototype etc. Mainly it has four phases
1. Requirement Collection
2. Design
3. Coding
4.Testing
Risk Management is the process which allows us to balance the operation and economical coast of the project.
Advantages :
1. Highly stable product.
2. Good for large projects.
3. Strong approval and documentation control.
4. Additional functionality can be added at later date.
5. Project monitoring is easy.
Disadvantages :
1. Costly model to use.
2. It is not suitable for low risk projects.
3. Doesn't work well for small projects.
4. There is a risk of not meeting the schedule and budget.
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