It is the simplest, oldest and most widely used process model. In this model, each phase of the life cycle is completed before the start of a new phase. It is actually the first engineering approach of software development.
Figure 1.2 depicts Water Fall Model.
The functions of various phases are discussed in software process technology. The waterfall model provides a systematic and sequential approach to software development and is better than the build and fix approach. But, in this model, complete requirements should be available at the time of commencement of the project, but in actual practice, the requirements keep on originating during different phases. The water fall model can accommodate the new requirements only in maintenance phase. Moreover, it does not incorporate any kind of risk assessment. In waterfall model, a working model of software is not available. Thus, there is no methods to judge the problems of software in between different phases.
A slight modification of the waterfall model is a model with feedback. Once software is developed and is operational, then the feedback to various phases may be given.
Figure 1.2 depicts Water Fall Model.
The functions of various phases are discussed in software process technology. The waterfall model provides a systematic and sequential approach to software development and is better than the build and fix approach. But, in this model, complete requirements should be available at the time of commencement of the project, but in actual practice, the requirements keep on originating during different phases. The water fall model can accommodate the new requirements only in maintenance phase. Moreover, it does not incorporate any kind of risk assessment. In waterfall model, a working model of software is not available. Thus, there is no methods to judge the problems of software in between different phases.
A slight modification of the waterfall model is a model with feedback. Once software is developed and is operational, then the feedback to various phases may be given.
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