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Systems Development

Systems Development. Systems Development Life Cycle (SDLC). A “baseline” process for the development of application systems Contains a comprehensive set of tasks to reduce risk in developing systems

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Systems Development

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  1. Systems Development

  2. Systems Development Life Cycle (SDLC) • A “baseline” process for the development of application systems • Contains a comprehensive set of tasks to reduce risk in developing systems • There are numerous specific SDLC models, but they typically differ primarily in the names of the phases/steps. • Basic premise behind SDLC is that you should • Make sure proposed system is feasible • Make sure you understand requirements thoroughly before proceeding to implementation • Thoroughly design the system before beginning programming • Scrutinize outputs of each phase to ensure you’re on track and should continue

  3. SDLC Model • Requirements analysis • Design • Implementation • Maintenance

  4. Requirements Analysis • Feasibility study • Cost/benefit analysis • Match with organizational objectives • Technical and operational feasibility • Risks • Requirements definition • What functions must the system perform? • System inputs, processing, outputs

  5. Design • How will the system perform the functions? • Design: • Programs • System hardware and software • Database • User interface

  6. Implementation • Building the system • Programming • Implement database • Testing • Create documentation (system and user) • Training • Conversion • Parallel • Cutover/direct • Pilot

  7. Maintenance • Ongoing error correction • Ongoing improvements (adding new functions) • Usually most IS resources spent here

  8. Alternative Development Approaches • Prototyping/Rapid application development • Successive iterations of system • Improve system with each iteration • Requires extensive user involvement • Good for systems where requirements are hard to define • Requires development tools that allow fast programming

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