Advantages and Disadvantages of Waterfall Model ?

Advantages of Waterfall Model:

This is linear simple model to implement & easy to maintain.
In the SDLC initial phase spent time on reviewing requirements and design which saves the time later.
Required resources are minimum in this model as compare to other.
After every phase of the model a document in created which help & simpler to understand & design the system.
Upon completion of coding, is done to check for implemented code or correctness of system.
For each stage deadlines can be set which will help to develop the system on decided time frame.

Disadvantages of Waterfall Model:

The biggest disadvantages of such system is it won’t allow to go back. If the problems in the design phase which creates complication in the implementation phase.
This model is rigid model. Not flexible & make changes is not possible in the development of system.
Unable to start the next phase before completing the previous phase so time consuming.
In the deployment phase all requirements are not covered or all requirements are not cover so adding such requirements may create unsuitable system.
To make it customer happy such new requirement need to be implemented in new version of system which leads to added cost to system development.

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