Spiral Model in SDLC

Advantages of Spiral Model:

• Software is produced early in the software life cycle.
• Risk handling is one of important advantages of the Spiral model, it is best development model to follow due to the risk analysis and risk handling at every phase.
• Flexibility in requirements. In this model, we can easily change requirements at later phases and can be incorporated accurately. Also, additional Functionality can be added at a later date.
• It is good for large and complex projects.
• It is good for customer satisfaction. We can involve customers in the development of products at early phase of the software development. Also, software is produced early in the software life cycle.
• Strong approval and documentation control.
• It is suitable for high risk projects, where business needs may be unstable. A highly customized product can be developed using this.

Disadvantages of Spiral Model:

• It is not suitable for small projects as it is expensive.
• It is much more complex than other SDLC models. Process is complex.
• Too much dependable on Risk Analysis and requires highly specific expertise.
• Difficulty in time management. As the number of phases is unknown at the start of the project, so time estimation is very difficult.
• Spiral may go on indefinitely.
• End of the project may not be known early.
• It is not suitable for low risk projects.
• May be hard to define objective, verifiable milestones. Large numbers of intermediate stages require excessive documentation.