SOFTWARE DEVELOPMENT LIFE CYCLE - SDLC LIFE CYCLE
- 1. System Development Life Cycle Faculty PGDCA (Software)
- 2. What is SDLC A Framework That describes the activities performed At each stage of A software development project
- 3. Approaches to Audit of System Development Process Concurrent Audit Postimplementation Audit General Audit
- 4. Normative Models of the System Development Process System Development Life Cycle Approach Sociotechnical Design Approach Political Approach Soft-systems Approach Prototyping Approach Contingency Approach
- 7. Phase-I Preliminary Tasks What is the problem Determine if a new system is needed Whether an alternative system will solve the problem Results Need for improving the existing system is recognised
- 9. Phase-II Feasibility Study Tasks Evaluate alternatives based upon Economic Feasibility-Do benefits justify costs-Net Present Value Technical Feasibility-Is reliable technology and training available Operational Feasibility-Will the management and users support it Value anlaysis
- 10. Phase-3 System Analysis Tasks Detailed study of various operations performed by the system Studying the existing organisational history, structure, and culture Define boundaries of the candidate system Data collection or data gathering
- 11. Phase-3 System Analysis Tools Data flow diagrams Interviews Onsite observations Questionnaires Data dictionaries
- 12. Phase-3 System Analysis Results SRS (Software Requirement Specification) document is finalised which includes: Functional and non-functional requirements What the system will do and what it is not expected to do Information about other systems with which system must interface
- 13. Phase-4 System Design Most creative and challenging phase Translates the performance requirements into design specifications Tasks How should the problem be solved Organisational and job designs prepared Information processing systems design Design of the database Design of the user interface Physical design Input data and master files are designed Output formats are designed
- 14. Phase-4 System Design Results Detailed System Document Procedural flowcharts Record layouts Report layouts Workable plan for implementing candidate system
- 15. Phase-5 System Coding and Testing
- 16. Phase-5 System Coding and Testing Build the system to the design specifications Develop the software Acquire the hardware Test the system for acceptance Program Testing (Unit testing) System Testing User Acceptance Testing Quality Assurance Testing
- 18. Phase-6 System Implementation Covert from old system to new system Compile final documentation Evaluate the new system
- 19. Phase-6 System Implementation Types of Conversion Direct/plunge/crash approach-entire new system completely replaces entire old system, in one step Parallel approach-both systems are operated side by side until the new system proves itself Pilot approach-launched new system for only one group within the business Phased/incremental approach-individual parts of new system are gradually phased-in over time
- 20. Phase-7 System Maintenance Keeping everything running
- 21. Phase-7 System Maintenance Types of Maintenance Correction of new bugs found (corrective) System adjustments to environmental changes and users’ changing needs (adaptive) Enhancing the performance, changes to use better techniques when they become available (perfective)
- 22. Thank you