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The spiral model is combined of some ideas from the iterative model but also the rigid features of the waterfall model. The spiral model has four phases: Identification, Design, Build and Evaluation. A spiral project passes through these phases in iterations, so the cycle repeats over until the deliverable is produced. The application is released incrementally.
Advantages of spiral model:
Disadvantages of the model:
The waterfall model is a methodology based on a sequential design process. The waterfall model flows from one stage to another and stages cannot be revisited once completed. One phase has to be finished to start the next phase. The waterfall model is made of 6 stages, which are: requirement analysis, design, implementation, testing, launching and maintenance. The waterfall model is used for small projects which have clear requirements from the start.
Advantages of this model:
Disadvantages of the model:
The agile methodologies, are in the agile manifesto 2001, these include: Scrum, Lean, XP, Crystal, FDD, and DSDM. Agile projects are flexible and contain iterative design and build process. Agile models are similar to the iterative model, as both models work through iterations. The model uses an adaptive approach, which allows for changes to be made, unlike more rigid models such as Waterfall or V-model, where a predictive approach with clear requirements is used. Agile development is a set of principles and values for developing a project. The four principles of agile methods are: Individuals and interactions, Delivering working software, customer collaboration and responding to change.
The disadvantages are:
When the agile model is used:
The idea of the iterative model is to develop a system through repeated cycles (iterations) and in smaller portions at a time (incrementally). It is important that the iterative model isn’t confused with the incremental model. The difference between them is that the iterative model is developed in iterations, where the whole system is developed at an early stage and then built up in the later stages of development. The incremental model however, the iterative model begins with the requirements being created and then the application is iteratively evolved until the product is finished and ready for deployment. The development starts with just one part of the application, rather than by creating the full system based on the full requirements. Each part of the product is reviewed, so that the requirements can be expanded later. After each iteration, the developers produce a new version of software, which evolves and expands the program; designs are modified and new functional capabilities are added.
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