System – an organized collection of independent tasks and processes that is designed to work together in order to accomplish specific objectives. The processes and tasks typically receive input(s) from and provide output(s) to other processes and tasks and even other systems. The tasks and processes may or may not be supported by automation.
SDLC refers to a methodology for developing systems. It provides a consistent framework of tasks and deliverables needed to develop systems. The SDLC methodology may be condensed to include only those activities appropriate for a particular project, whether the system is automated or manual, whether it is a new system, or an enhancement to existing systems. The SDLC methodology tracks a project from an idea developed by the user, through a feasibility study, systems analysis and design, programming, pilot testing, implementation, and post-implementation analysis. Documentation developed during the project development is used in the future when the system is reassessed for its continuation, modification, or deletion.
SDLC Phases Phases in SDLC are Planning, Analysis, Design, Implementation, and Maintenance/Sustainment/Staging
- Project planning, feasibility study: Establishes a high-level view of the intended project and determines its goals.
- Systems analysis, requirements definition: Refines project goals into defined functions and operation of the intended application. Analyzes end-user information needs.
- Systems design:Describes desired features and operations in detail, including screen layouts, business rules, process diagrams, pseudo code and other documentation.
- Implementation (Development):The real code is written here.
- Integration and testing: Brings all the pieces together into a special testing environment, then checks for errors, bugs and interoperability.
- Acceptance, installation, deployment: The final stage of initial development, where the software is put into production and runs actual business.
- Maintenance: What happens during the rest of the software’s life: changes, correction, additions, moves to a different computing platform and more.
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