The waterfall development model is primarily used by large software companies. The incremental model is used by small companies and individuals.
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RDA is Rapid Application Development which emphasizes on short development where Incremental is completing one complete phase then move to the second phase means increment by one..
Major difference between waterfall and iterative model is that waterfall model has a linear process in which full product is available after the last phase, while incremental model full product is available after several such phases.
There are many differences exists between waterfall model and spiral model. In waterfall model if any sudden change takes place in the project, then its very hard to fix the issue. Wherein spiral model we can change according to our requirement.
The RAD model, also known as the Rapid Application Development, is a linear software for creating prototypes. The Waterfall model is a sequential software.
In incremental model the real product is designed, implemented, integrated and tested as a series of incremental builds. while In prototype model the prototype (not the real product) is designed, implemented, integrated and tested as a series of incremental builds