SDLC(System Development Life Cycle) is a systematic process of developing any software systems.It is a part of software engineering.IEEE defines it as '...the period that starts when the product is conceived and ends when the software is no longer available for use'. SDLC is composed up of many different steps known as 'System Development Life Cycle'.Here,the point to be noted is that,there are many types of models developed by different software scientists for developing software systems and each of them uses different techniques and steps.some of the popular SDLC approaches are discussed.
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