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From IFSM 201 - Module 2: Information System Development
Topics • Purpose of the Systems Development Life Cycle (SDLC) • The SDLC Phases • SDLC Models • Relationship between SDLC and Project Management • Summary
Purpose of the Systems Development Life Cycle (SDLC)
What Is SDLC?
The systems development life cycle (SDLC) is a structured methodology and process that guides the development of information systems. SDLC is based on a series of related activities that are combined into phases, sometimes called life-cycle phases. The phases represent a state or stage in the life of an information system. Generally speaking, an information system life cycle proceeds from requirements gathering to
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Although the number of SDLC activities can vary depending on the type and complexity of the information-system project or the SDLC model used, there are some common guidelines that allow the activities to be grouped into clearly defined phases. These recommended guidelines are outlined below. • Complete a preliminary investigation, requirements analysis, and system recommendation. • Specify a detailed design based on an approved set of requirements. • Develop the system according to the approved design specification. • Test the system and gain user acceptance. • Install, operate, and maintain the accepted system. • Update or replace the system as organizational goals and requirements change. • Decommission the system when it is no longer needed. • Document, report on, and approve each phase of the SDLC before beginning the next phase.
Following these common guidelines helps mitigate the risk that the design and development effort will get out of control either through missed requirements, schedule delays, or cost overruns. Because the guidelines require interaction with stakeholders throughout the project, they also prevent surprises when the system is rolled out to the user community. As you read through the approaches in the following sections, see if you can identify these common steps.
Four-Phase Approach
This approach divides the life cycle into four major

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