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System development life cycle-Naveen vijay

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  • 1. NAVEEN & VINU SMBS SDLC SMBS
  • 2. SDLC SMBS
  • 3. THE SYSTEM DEVELOPMENT LIFE CYCLE What is an information system ? Hardware, software, data, Hardware, software, data, people, and procedures that people, and procedures that work together to produce work together to produce quality information quality information System—Set of components System—Set of components that interact to achieve that interact to achieve common goal common goal SDLC SMBS
  • 4. THE SYSTEM DEVELOPMENT LIFE CYCLE Phases of the SYSTEM DEVELOPMENT CYCLE Phase 2. Analysis  Phase 1. Planning    Review project requests Prioritize project requestss Identify project development team  Conduct preliminary investigation Perform detailed analysis activities: Study current system Determine user requirements Recommend solution Phase 5. Support    Conduct post-implementation system review Identify errors and enhancements Monitor system performance Phase 3. Design   Phase 4. Implementation     Develop programs, if necessary Install and test new system Train users Convert to new system SDLC SMBS Acquire hardware and software, if necessary Develop details of system
  • 5. THE SYSTEM DEVELOPMENT LIFE CYCLE SDLC SMBS
  • 6. THE SYSTEM DEVELOPMENT LIFE CYCLE SDLC SMBS
  • 7. THE SYSTEM DEVELOPMENT LIFE CYCLE What are some reasons to create or modify an information system? To correct problem in existing system To improve existing system Outside group may mandate change Competition can lead to change SDLC SMBS
  • 8. THE SYSTEM DEVELOPMENT LIFE CYCLE PLANNING PHASE Begins when steering committee receives project request Steering committee— decision-making body for the company Function of committee: Review and approve project requests Prioritize project requests Allocate resources SDLC SMBS Form project development team for each approved project
  • 9. THE SYSTEM DEVELOPMENT LIFE CYCLE ANALYSIS PHASE SDLC SMBS
  • 10. SYSTEMS ANALYSIS SDLC SMBS "ANALYSIS PHASE"
  • 11. SYSTEM ANALYSIS Systems analysis is the application of analytical processes to the planning, design and implementation of new and improved information systems to meet the business requirements of customer organizations. SDLC SMBS "ANALYSIS PHASE"
  • 12. THE SYSTEM DEVELOPMENT LIFE CYCLE ANALYSIS PHASE Conduct preliminary investigation, Cost Estimates What are the users NEED? What are the users NEED? Alternatives, Existing system Evaluation What must be done to solve? What must be done to solve? SDLC SMBS "ANALYSIS PHASE"
  • 13. THE SYSTEM DEVELOPMENT LIFE CYCLE What is the preliminary investigation?  Determine exact nature of problem or improvement and whether it is worth pursuing  Findings are presented in feasibility report, also known as a feasibility study SDLC SMBS "ANALYSIS PHASE"
  • 14. THE SYSTEM DEVELOPMENT LIFE CYCLE Some information gathering techniques      Review documentation Observe Questionnaire Interview Research SDLC SMBS "ANALYSIS PHASE"
  • 15. THE SYSTEM DEVELOPMENT LIFE CYCLE What is detailed analysis? 1. Study how current system works 2. Determine user’s wants, needs, and requirements 3. Recommend solution Sometimes called logical design SDLC SMBS "ANALYSIS PHASE"
  • 16. THE SYSTEM DEVELOPMENT LIFE CYCLE FACT FINDING Facts about existing systems can be found out by:     Asking questions (Interviews with users). Questionnaires (Completed by users). Observation (Watching how the work is done at present). Inspection (Looking at existing paperwork, screen displays, and filing systems). SDLC SMBS "ANALYSIS PHASE"
  • 17. THE SYSTEM DEVELOPMENT LIFE CYCLE What is FEASIBILITY? Measure of how suitable system development will be to the company Operational feasibility Four feasibility tests: Schedule feasibility Economic feasibility (also called cost/benefit feasibility) Technical feasibility SDLC SMBS "ANALYSIS PHASE"
  • 18. THE SYSTEM DEVELOPMENT LIFE CYCLE FEASIBILITY STUDY    The aim of a feasibility study is to see if it is possible to devise a system that can be implemented and that will work at a reasonable cost. The study ends when a decision whether or not to proceed with the new system has been made. The results of the study are usually presented as a feasibility report. SDLC SMBS "ANALYSIS PHASE"
  • 19. THE SYSTEM DEVELOPMENT LIFE CYCLE The FEASIBILITY STUDY will normally include:      A description of the tasks the system is required to do. A preliminary design and initial costs for the system. Alternative designs so that the most appropriate can be chosen. A cost/benefit analysis. Conclusions as to whether or not the design is worth implementing and which of the alternatives should be chosen. SDLC SMBS "ANALYSIS PHASE"
  • 20. THE SYSTEM DEVELOPMENT LIFE CYCLE The ANALYSIS PHASE includes:  The drawing of system flow charts and data flow diagrams.  The identification of the proposed system’s objectives.  Facts about the system that is going to be replaced.  An outline of any constraints or limits (e.g. lack of time, money, or staff training).  An updated cost/benefit analysis.  An outline of any further developments of the system. SDLC SMBS "ANALYSIS PHASE"
  • 21. THE SYSTEM DEVELOPMENT LIFE CYCLE QUERIES? QUESTIONS? SDLC SMBS
  • 22. THE SYSTEM DEVELOPMENT LIFE CYCLE DESIGN PHASE Acquire hardware and software Acquire hardware and software Develop all details of new or Develop all details of new or modified information system modified information system How must the problem be solved? How must the problem be solved? Program Construction and Testing Program Construction and Testing SDLC SMBS
  • 23. THE SYSTEM DEVELOPMENT LIFE CYCLE What is a detailed design? Detailed design specifications for components in proposed solution Includes several activities Database Database design design Input and Input and output design output design Program Program design design SDLC SMBS
  • 24. THE SYSTEM DEVELOPMENT LIFE CYCLE TYPES OF TESTS Unit Test Integration test Verifies each individual program works by itself Combine each units and verify it User acceptance Test Verifies application works with the users system SDLC SMBS
  • 25. THE SYSTEM DEVELOPMENT LIFE CYCLE IMPLEMENTATION PHASE  Purpose is to construct, or build, new or modified system and then deliver it to users Convert to new system Train users Install and test new system Develop programs SDLC SMBS
  • 26. THE SYSTEM DEVELOPMENT LIFE CYCLE SUPPORT PHASE  Provides ongoing assistance after system is implemented Conduct post-implementation system review—meeting to find out if information system is performing according to expectations EVALUATION MAINTENANCE Is the key system is running? SDLC SMBS
  • 27. THE SYSTEM DEVELOPMENT LIFE CYCLE QUERIES OR QUESTIONS? SDLC SMBS
  • 28. SDLC SMBS