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..
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The RAD model, also known as the Rapid Application Development, is a linear software for creating prototypes. The Waterfall model is a sequential software.
RAD stands for rapid application development model in short. RAD can be used on systems that can be time- boxed to deliver functionality in increments.
General Software Process Models are 1. Waterfall model: Separate and distinct phases of specification and development. 2. Prototype model. 3. Rapid application development model (RAD). 4. Evolutionary development: Specification, development and validation are interleaved. 5. Incremental model. 6. Iterative model. 7. Spiral model. 8. Component-based software engineering
The reason why you might not find differences in the sdlc and rad is because RAD is a more sped-up version of the SDLC. RAD is typically used in small to medium size projects, while the SDLC is generally used for large projects. Another difference is that in the SDLC, one can control the scope creep of the project, whereas that is very limited when one implements RAD because you give it up for faster implementation times. In RAD you have alot of feedback from the user to refine the program more to the aspects of the user, whereas you dont get the same user input in the SDLC. This feedback loop is another reason that RAD is sometimes chosen over the SDLC
The spiral model is called a meta model since it encloses all other life cycle model.