Waterfall Model (post 3U1)
Waterfall model is the simplest model of software
development paradigm. It says the all the phases of SDLC will function one after
another in linear manner. That is, when the first phase is finished then only
the second phase will start and so on.
This model assumes that everything is carried out
and taken place perfectly as planned in the previous stage and there is no need
to think about the past issues that may arise in the next phase. This model
does not work smoothly if there are some issues left at the previous step. The
sequential nature of model does not allow us go back and undo or redo our
actions.
Itrative model
This model is best suited when developers already
have designed and developed similar software in the past and are aware of all
its domains.
This model leads the software development process
in iterations. It projects the process of development in cyclic manner
repeating every step after every cycle of SDLC process. The software is first
developed on very small scale and all the steps are followed which are taken
into consideration. Then, on every next iteration, more features and modules
are designed, coded, tested and added to the software. Every cycle produces a
software, which is complete in itself and has more features and capabilities
than that of the previous one.
After each iteration, the management team can do
work on risk management and prepare for the next iteration. Because a cycle
includes small portion of whole software process, it is easier to manage the
development process but it consumes more resources.
There having some
other models used in SE are:
1.
Spiral Model
2.
V – model
3.
Big Bang Model
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