Waterfall Model is a sequential model that divides software development into pre-defined phases. Each phase must be completed before the next phase can begin with no overlap between the phases. Each phase is designed for performing specific activity during the SDLC phase. It was introduced in 1970 by Winston Royce.
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| - Error can be fixed only during the phase.
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| - It is not desirable for complex project where requirement changes frequently.
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| - Testing period comes quite late in the developmental process.
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| - Documentation occupies a lot of time of developers and testers.
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| - Clients valuable feedback cannot be included with ongoing development phase.
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| - Small changes or errors that arise in the completed software may cause a lot of problems.
- Delivering the product at end of the development phase.so Customer won't be able to see the product until delivered. If the product is not what the customer wants, then the project is failed. Costs the software company more money and the reputation.
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