- This spiral model had four phases planing, risk analysis, engineering and evaluation.
- It emphasis more on risk analysis.
- In this model the project undergoes each phases repeatedly called spirals.
- The planning phase is the baseline spiral and each subsequent spiral is build on spiral model
- This type of model is used in risk analyzing for eg: in space crafts.
- Importance is placed more on risk analysis
- Software is produced in the early stage.
- Not suitable for small projects
- It is very costly
- Needs expertise for such model