Introduction to Component Based Development Model
In the most cases of software projects, the software uses the reusability feature to reuse some already built parts. Such parts are called as the components. Consider some people are working on a new project and require some built parts or components of design or code which are stored in library then that reusable parts can either directly be used or if needed some modifications and changes can be done on it. In this revolutionary approach, reuse is after seen as necessary for rapid system development.
So using these components, integration is done with these components. This model uses many features of the spiral model and evolutionary in nature. But the basic difference is only the use of components.
In fig2.15, the components based development model is shown. As in figure it goes through the spiral model loops. The procedure is just like the spiral model which has been seen in 2.3, 3.4,2... In concept development phase, like any new candidate component is required and there is some probability to get it from the library. If it is available there then that component is extracted for use otherwise that part is to be built. After using it with the software as a candidate component, it can be put in the library for future use. In this way this iterative process will continue until all the candidate components are built.
Advantages
Reusability: This model has inherent advantage of software reuse.
Reduction in Total Time: Component assembly leads to 70% reduction in development cycle time.
Less Cost: Substantial reduction in project cost is achieved.
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