<Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> The system development life cycle framework provides a sequence of activities for system designers and developers to follow . It consists of a set of steps or phases in which each phase of the SDLC uses the results of the previous one . </P> <P> The SDLC adheres to important phases that are essential for developers, such as planning, analysis, design, and implementation, and are explained in the section below . It includes evaluation of present system, information gathering, feasibility study and request approval . A number of SDLC models have been created: waterfall, fountain, spiral, build and fix, rapid prototyping, incremental, synchronize and stabilize . The oldest of these, and the best known, is the waterfall model: a sequence of stages in which the output of each stage becomes the input for the next . These stages can be characterized and divided up in different ways, including the following: </P> <Ul> <Li> Preliminary analysis: The objective of phase 1 is to conduct a preliminary analysis, propose alternative solutions, describe costs and benefits and submit a preliminary plan with recommendations . </Li> </Ul>

Phases of sdlc in system analysis and design
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