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System development life cycle What is the system development life cycle? The system development life cycle is the process of developing information systems through investigation, analysis, design, implementation and maintenance. System development life cycle is a systems approach to problem solving and is made up of several phases, each comprised of multiple steps. System development life cycle is also known as Classic Life Cycle Model (or) Linear Sequential Model (or) Waterfall Method. This has the following activities. . System/Information Engineering and Modeling, Software Requirements Analysis, Systems Analysis and Design, Code Generation, Testing, and Maintenance. System/Information Engineering and Modeling is always part of a large business system, work begins by establishing requirements for all system elements and then allocating some subset of these requirements to software. This system view is essential when software must interface with other elements such as hardware, people and other resources. System is the basic and very critical requir