SDLC stands for Software Development LifeCycle and it is the process of developing information system with proper analysis, design, implementation and maintenance. SDLC is said to be equal to layer two of open systems interconnection or OSI model of network communication. This level of protocol assures proper flow of data from one level to another. SDLC is important because it breaks down the entire life cycle of software development thus make is easier to evaluate each part of software development and also makes it easier for programmers to work concurrently on each phase.

The field of Software Engineering is relatively new and introduction of scientific approaches for software development has been a recent phenomenon. As software use proliferated in late 70s and early 80s, and as programming languages evolved from assembly languages to higher level procedural and object oriented languages, software development experts in industry and universities started looking for ways to improve quality and reliability of their products. The result was