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System Development Life Cycle (SDLC)

System Development Life Cycle (SDLC). Contents. Phases of SDLC Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 Phase 6 Deliverables of SDLC. 2. Six Phases of the SDLC. Preliminary Investigation Assesses feasibility and practicality of system. System Analysis

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System Development Life Cycle (SDLC)

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  1. System DevelopmentLife Cycle (SDLC)

  2. Contents.. • Phases of SDLC • Phase 1 • Phase 2 • Phase 3 • Phase 4 • Phase 5 • Phase 6 • Deliverables of SDLC 2

  3. Six Phases of the SDLC • Preliminary Investigation • Assesses feasibility and practicality of system. • System Analysis • Study old system and identify new requirements. • Defines system from user's view. • System Design • Design new/alternative system. • Defines system from technical view. 3

  4. System Development • New hardware and software is acquired, developed, and tested. • System Implementation • System installation and training. • System Operation & Maintenance • Daily operation. • Periodic evaluation and updating. 4

  5. SDLC Phases Preliminary Investigation System System Operation Analysis & Maintenance System System Implementation n Design System BACK D evelopment 5

  6. Phase 1: Preliminary Investigation BACK • Determine if a new system is needed. • Three primary tasks: • Define the problem. • By observation and interview, determine what information is needed by whom, when, where and why. • Suggest alternative solutions. • Prepare a short report. 6

  7. Phase 2: System Analysis BACK • In depth study of the existing system to determine what the new system should do. • Expand on data gathered in Phase 1 • In addition to observation and interviews, examine: • Formal lines of authority. • Standard operating procedures. • How information flows. • Reasons for any inefficiencies. 7

  8. Phase 3: System Design BACK • Uses specifications from the systems analysis to design alternative systems. • Evaluate alternatives based upon: • Economic feasibility - Do benefits justify costs? • Technical feasibility - Is reliable technology and training available? • Operational feasibility - Will the managers and users support it? 8

  9. Phase 4: System Development BACK • Build the system to the design specifications . • Develop the software: • Purchase off-the-shelf software OR. • Write custom software. • Acquire the hardware. • Test the new system. • Module (unit) test - tests each part of system. • Integration testing - tests system as one unit. • Create manuals for users and operators. 9

  10. Phase 5: System Implementation BACK • Convert from old system to new system. • Train users. • Compile final documentation. • Evaluate the new system. 10

  11. Phase 6: Operations & Maintenance BACK • Types of changes: • Physical repair of the system. • Correction of new bugs found (corrective). • System adjustments to environmental changes. • Adjustments for users’ changing needs (adaptive). • Changes to user better techniques when they become available (perfective. 11

  12. Approved Feasibility Study Abort Project Preliminary Goto next phase Investigation Goto Previous phase Problem Specifications System Analysis System Design Specifications Design Coded and Tested System System Development Begin building new system System System converted Implementation Users trained System Maintenance Operational System Documentation completed Deliverables of the SDLC BACK 12

  13. BACK THANK YOU 13

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