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13. CHAPTER. SYSTEMS ANALYSIS AND DESIGN. Competencies. Describe the six phases of the systems life cycle Identify information needs and formulate possible solutions Analyze existing information systems & evaluate the feasibility of alternative systems. Competencies cont.

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  1. 13 CHAPTER SYSTEMS ANALYSIS AND DESIGN

  2. Competencies • Describe the six phases of the systems life cycle • Identify information needs and formulate possible solutions • Analyze existing information systems & evaluate the feasibility of alternative systems

  3. Competencies cont. • Identify, acquire, and test new system software and hardware • Switch from an existing information system to a new one • Perform system audits and periodic evaluations

  4. System Analysis and Design

  5. Phase 1Preliminary Investigation • Define the problem • Suggest alternative systems • Prepare a short report

  6. Phase 2 – Analysis • Gathering data • Analyzing the data • Document systems analysis

  7. Analyzing the Data • Checklist • Top-down analysis method • Grid charts • Decision tables • System flowcharts • Data flow diagrams • Automated design tools

  8. Phase 3Design • Designing alternative systems • Economic feasibility • Technical feasibility • Operational feasibility • Selecting the best system • Write the systems design report

  9. Phase 4Development • Acquiring software • Acquiring hardware • Testing the new system

  10. Phase 5Implementation • Types of conversion • Direct • Parallel • Pilot • Phased • Training

  11. Phase 6Maintenance • Ongoing activity • Two parts • Systems audit • Periodic evaluation

  12. Prototyping and Rapid Applications Development • Alternative to the systems life cycle • Use if systems life cycle is not feasible • Prototyping is building a model • RAD – Rapid applications development

  13. A Look to the FutureRapid Change • Pace of business is now faster • To stay competitive, new technologies must be incorporated • Increased use of RAD and prototyping • Increased use of outside consulting

  14. automated design tool (365) checklist (363) Computer-aided software engineering tools (CASE) (365) conversion (369) data flow diagram (365) decision table (364) direct approach (369) economic feasibility (367) grid chart (364) operational feasibility (367) organization chart (362) parallel approach (370) phased approach (370) Key Terms

  15. pilot approach (370) preliminary investigation (359) prototyping (373) rapid applications development (RAD) (373) system (358) system flowchart (364) systems analysis (362) systems analysis report (366) systems analyst (358) systems audit (372) systems design (366) systems design report (367) Key Terms

  16. systems development (368) systems implementation (369) systems life cycle (358) systems maintenance (371) technical feasibility (367) top-down analysis method (363) Key Terms

  17. FAQs • What is a system? • What are the responsibilities of a system analyst? • Why is a preliminary investigation important for a new information system? • List several of the tools used for the analysis of data. • What is prototyping?

  18. Discussion Questions • What is systems analysis? • What are the three tasks of systems design? Explain. • Explain the four approaches to conversion to a new information system. • Explain the need for RAD.

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