Differentiate Between Waterfall Model and Incremental Model.

S.NO	Waterfall Model	Incremental Model
1)	The waterfall model is called a linear sequential life cycle model as it develops the software sequentially.	The incremental model is iterative. it develops the software in  multiple iterations.
2)	In waterfall model , the software is developed in sequence and delivered at the end at once.	In incremental model , the software is developed in increments and each phase is delivered separately at successive points.
3)	Requirements cannot be changed once fixed.	Requirements can be changed after every increment.
4)	Risks are high in waterfall model and cannot be analyzed before the last phase.	Risks are identified and solved after every iteration.
5)	Changing the requirements  becomes costly as all the phases from the beginning  have to be repeated	Changing the requirements in the incremental model is easy , as new features can be added after every iteration.