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Difference between prototype model and spiral model?

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The spiral modle allows you to return to previous stages in the SDLC when new requirements or changes to previous sections are realised but generaly only allows for one final release to be made.

It also doesnt involve the customer(or user) in its sections other than requirements gathering.

the prototype (or evolutionary model) allows for a number of prototypes to be released to be tested by the customer. It also allows previous sections to be revisited if new requirements or designs are realised. it can be more costly and the structure of the project can be compramised due to constant changes is managed poorly. However the finished product is often better suited to what the customer(or user) requires.

carry out some research on the two as i've not done any work on system development life cycle and the different methodologies in a while but i'm pritty sure the above is correct.

Edited by ChrisHunter because: n/a
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