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Model of the software development life cycle, highlighting the maintenance phase. In systems engineering, information systems and software engineering, the systems development life cycle (SDLC), also referred to as the application development life cycle, is a process for planning, creating, testing, and deploying an information system. [1]
Operations: the installation, migration, support, and maintenance of complete systems; Thus, the waterfall model maintains that one should move to a phase only when its preceding phase is reviewed and verified. Various modified waterfall models (including Royce's final model), however, can include slight or major variations on this process. [8]
In software engineering, a software development process or software development life cycle (SDLC) is a process of planning and managing software development. It typically involves dividing software development work into smaller, parallel, or sequential steps or sub-processes to improve design and/or product management .
ISO/IEC/IEEE 12207 Systems and software engineering – Software life cycle processes [1] is an international standard for software lifecycle processes. First introduced in 1995, it aims to be a primary standard that defines all the processes required for developing and maintaining software systems, including the outcomes and/or activities of each process.
SDLC may refer to: Systems development life cycle or system design life cycle, which is often used in the process of software development;
The V-model is a graphical representation of a systems development lifecycle.It is used to produce rigorous development lifecycle models and project management models. The V-model falls into three broad categories, the German V-Modell, a general testing model, and the US government standard.
If conceived of as part of the software development life cycle, maintenance is the last and typically the longest phase of the cycle, [7] [8] comprising 80 to 90 percent of the lifecycle cost. [9] Other models consider maintenance separate from software development, instead as part of the software maintenance life cycle (SMLC). [ 8 ]
According to K.H.Bennett and V.T Rajlich, [14] the key contribution is to separate the 'maintenance' phase into an evolution stage followed by a servicing and phase out stages. The first version of software system which is lacking some features will be developed during initial development or also known as alpha stage. [ 14 ]