What is Spiral Model?
Spiral Model is one of the oldest form of the Software Development Life Cycle Models(SDLC), which was first defined by the Barry Boehm in the year 1986. Basically, this model is an evolutionary type model, which works on the combined approach of the waterfall and iterative model.
This model is driven by the risk analysis and evaluation requirements and keeps on iterating, covering each phase of the model repeatedly, until the final products achieved, fulfils all the requirements that were evolved before and during the development process.
Spiral model, generally involves four phases, which are followed repeatedly, in each round of the model, until no further requirements are needed to be implemented in the software product.
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 a later date.
Software is produced early in the software life cycle.
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
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