Answer / n@n!

waterfall model/linear sequential model:

->when the requirements are clear and implementation is
possible then we go for waterfall model.
->it is parent model to all other remaining models.
adv:
---
-> easy to understand
-> good for small projects
-> easy to work

dis adv:
--------
-> difficult for complex projects
-> difficult for long and on going projects
-> difficult for object oriented projects
-> feedback is problem


V-model:
-------
verification/unconventional/quality assurence
and
validation/conventioanl/quality control is nothing but V-
model
-> v-model was comming from waterfall model

adv:
----
-> every company follows this model
-> easy to understand
-> it take less time to complete the project

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