In waterfall model, once we come out of the phase, there is no chance of modifying it again. This is one of the major drawback for waterfall model.

Waterfall is one of the software development life cycle model. Waterfall model has five stages.

Advantage of waterfall model : It is simple and easy to use.

Dis Advantage of waterfall model : no user feedbacks are taken.

Expalin different between waterfall model and prototyping model ? Expalin different between waterfall model and prototyping model ?

Modified waterfall model verified and validate the user requirements for every phase. Meanwhile, waterfall did not, it only verify and validate user requirement at the end of the phase.