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System Development Life Cycle

System Development Life Cycle. What is SDLC?. The formal process by which organizations build systems is known as SDLC. Also referred to as Application Development Life Cycle or Structured Development Life Cycle. TQM/RE. TQM-Total Quality Management

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System Development Life Cycle

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  1. System Development Life Cycle

  2. What is SDLC? The formal process by which organizations build systems is known as SDLC. Also referred to as Application Development Life Cycle or Structured Development Life Cycle

  3. TQM/RE TQM-Total Quality Management Set of business practices which improve profit and productivity RE- Reengineering/Process Innovation Changing fundamental procedures reexamining/repositioning corporate Strategies.

  4. TQM/RE Goals • Improve quality of all company activities • Reduce costs • Improve timelines • Other business goals

  5. Why systems fail? • Lack of communication between people • Continuing the old system • Failure of parts of system not fitting • Lack of management Support • Technological Incompetence • Changes in technology in the middle • Lack of user involvement/training/support • (missing JAD-Joint Application Development)

  6. Why systems fail?(Not following steps of SDLC) • System does not meet users’ needs • Unnecessary/insufficient hardware is acquired • Software inadequately tested

  7. Six Phases of SDLC • Preliminary Investigation • Systems Analysis • Systems Design • Systems Development/Acquision • Systems Implementation • Systems Maintenance • Person in charge: Project LeaderSystem Analyst/Engineer

  8. 1. Preliminary Investigation (feasibility study) Determine the organization’s objective Read internal/external documents Interview users/executives Nature and scope of problems Propose alternative solutions leave the system as is modify the existing system develop a new system Describe costs/benefits of each solution Submit a preliminary plan with recommendation

  9. 1. Preliminary Investigation • Benefits • Tangible Cost savings • Profitability/Productivity • Intangible • Employer satisfaction BPR (Business Process reengineering) independent of IT Processes are identified for bottlenecks, removed, then IT is applied.

  10. 2. System Analysis Gather data documents, interviews, questionnaires, observations, sampling Analyze data CASE tools, DFDs, Data Dictionary, System Flowcharts, Connectivity Diagrams, Grid Charts, Decision Tables Write a report Written report Approval from the Manager next phase

  11. 3. System Design Preliminary Design describes the functional capabilities of the system CASE tools, PM Software Detailed Design Output Requirements Input Requirements Storage Requirements Processing/Network Requirements System Backup

  12. 4. System Development Substantial expenditures of money/time Acquire software Acquire hardware Test the System Unit Testing Integrated testing Workable system ready to be implemented

  13. 5. System Implementation • Objective:To make system not just workable but successful • 1. Software Conversion/Data conversion • 4 Major strategies • Direct Implementation • Parallel Implementation • Phased Implementation • Pilot Implementation • 2. Documentation • 3. Training

  14. 4. System Maintenance Never ending phase Adjustments/improvements system monitoring Auditing- independent auditor’s review Evaluation- outside system analyst Once the system is old enough SDLC is started all over again.

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