Waterfall and spiral lifecycles
Spiral
It is used
in big development projects and in the stages there are arranged in the shape
of a spiral, it is used when somebody wants to use a new technology
The spiral
is also another software development process, it combines pieces of the
waterfall model with the features of prototyping this model was developed to be
used for large and complicated projects which will be expensive
The process
of development will normally be closely tied to the waterfall model, both
models having similar stages
What kind of projects are they suitable for?
Projects
which are large and will cost a lot of money and are very complicated the
spiral model looks to be suited to the larger and more important tasks and is
not suited for small projects.
Waterfall
This
lifecycle uses a sequential method of stages and they have a clear goal for
each development stage when using this you cannot go back to the previous stage
although this waterfall model is very easy to use.
The
waterfall method is used for software development and contains several stages,
requirements specification, design, construction/implementation, integration,
testing and debugging, installation, maintenance
The
waterfall model should move to a phase only when it’s previous stage is
completed and perfected
What kind of projects are they suitable for?
They are
suitable to projects that have low risk in the areas of user interface and the
performance requirements, but have a high risk in budget and schedule
predictability and control
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