Various models of software development process


In this tutorial, you will learn about, Various models of software development process.

In the software development process, we focus on the activities directly related to the production of the software. The development process model specifies some model specifies some activities that are defined according to that specific model. And they should be performed in the order in which they are defined. The major factors behind specifying or developing a different model are quality assurance and the type of the project.

The various models are:

a)Waterfall model.
b)Prototype model.
c)Evolutionary model.
d)Spiral model.

a)Waterfall Model: the simplest software development model is the waterfall model, which states that the phases are organized in a linear order. There are various variations of the waterfall model depending upon the nature of activities and the flow control between the phases.
In a typical model, a project begins with requirement analysis and specification that is associated with the feasibility study of the project after the requirements are successfully determined the design phase starts and the coding starts after the design phase. In the coding phase, unit testing is also done. Once the programming is completed the code is integrated and testing is done, on the successful completion of the testing, the system is installed.

Waterfall model

                                                                   Fig: Waterfall model

Limitation and advantages of waterfall models:

The waterfall model is the simplest and fastest system development model. Its phases can be selected and organized according to the project or the developer. The major limitation of the waterfall model is the requirements are frozen (fixed) before the design begins. And of the requirement specified are incorrect the resulting software of system will be incorrect. Another limitation of waterfall model is its phases are independent that is we cannot move back to any previous phases in this model, for making any kind of changes the process has to be started again from the beginning that is from phase 1. But the waterfall model is good for small projects where requirements are clearly specified in the beginning.

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