One of the problems of the waterfall nature of the SDLC is that the team needs to do more requirements work,even after a phase is supposedly finished.

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In the waterfall SDLC model, each phase needs to be completed before moving onto the next phase. This means that if there are any changes or new requirements that arise later in the development cycle, the team may need to go back to the previous phase to make changes or additions. This can result in additional requirements work, even after a phase is supposedly finished.

One of the Problems of the Waterfall Nature of the SDLC