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Different Approaches To Sys Bldg

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The document discusses different approaches to systems building, including the traditional systems lifecycle model consisting of definition, feasibility, design, development, testing, implementation, evaluation and maintenance phases. It also covers prototyping, using application software packages, end-user development, outsourcing, structured methodologies, object-oriented development, computer-aided software engineering and software reengineering.

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DIFFERENT APPROACHES TO SYSTEMS BUILDING
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System Lifecycle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object]
Prototyping process of building experimental system to demonstrate, evaluate approach. an iterative process best for design of end-user interface
Steps in Prototyping: Prototyping ,[object Object],3. Use Prototype 2. Develop Prototype 4. Revise & Enhance Prototype
Application Software Packages prewritten, precoded application software, commercially available for sale/lease customization geared to common requirements
Modifying Software Package to meet organization’s unique requirements without destroying the integrity of package Application Software Packages Customization Raises Development Cost
Effects of Customizing Software on Total Implementation Costs Application Software Packages 0 2 4 6 8 10 0.5 1 2 3 4 5 % LINES OF CODE CONVERTED TOTAL IMPLEMENTATION COSTS
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Request For Proposal (RFP) Application Software Packages
End-User Development end-users develop information system with little help from technical specialists using 4 th generation tools
End-User Development ,[object Object],[object Object],[object Object],Weaknesses Strengths ,[object Object],[object Object],[object Object],[object Object]
Information Center ,[object Object],[object Object],End-User Development Managing End-User Development
“ Outsourcing”
Outsourcing ,[object Object]
When to Outsource? ,[object Object],[object Object],[object Object]
System Building Methodologies
Structured Methodologies ,[object Object]
Structured Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object]
Structured Design ,[object Object],[object Object],[object Object],[object Object],[object Object],Structured Programming
PROGRAM FLOWCHART SYMBOLS: BEGIN OR END DIRECTION PROCESS DECISION INPUT OR OUTPUT SUBROUTINE MANUAL OPERATION CONNECTOR
PROGRAM FLOWCHART: PROCESS A PROCESS B SEQUENCE PROCESS C PROCESS D R TRUE SELECTION PROCESS E S TRUE ITERATION
This flowchart shows the software development cycle. You basically design the system, code it and test it. When an error is found, it must be determined whether the error is a design error or not. Coding errors can quickly be fixed, but design errors may take longer. 
OBJECT – ORIENTED SOFTWARE DEVELOPMENT ,[object Object],[object Object],[object Object]
OBJECT – ORIENTED SOFTWARE DEVELOPMENT ,[object Object]
COMPUTER-AIDED SOFTWARE DEVELOPMENT ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],COMPUTER-AIDED SOFTWARE DEVELOPMENT
SOFTWARE REENGINEERING ,[object Object],[object Object],[object Object],[object Object],[object Object]
SOFTWARE REENGINEERING ,[object Object],[object Object],[object Object]

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Different Approaches To Sys Bldg

  • 1. DIFFERENT APPROACHES TO SYSTEMS BUILDING
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  • 13. Prototyping process of building experimental system to demonstrate, evaluate approach. an iterative process best for design of end-user interface
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  • 15. Application Software Packages prewritten, precoded application software, commercially available for sale/lease customization geared to common requirements
  • 16. Modifying Software Package to meet organization’s unique requirements without destroying the integrity of package Application Software Packages Customization Raises Development Cost
  • 17. Effects of Customizing Software on Total Implementation Costs Application Software Packages 0 2 4 6 8 10 0.5 1 2 3 4 5 % LINES OF CODE CONVERTED TOTAL IMPLEMENTATION COSTS
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  • 19. End-User Development end-users develop information system with little help from technical specialists using 4 th generation tools
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  • 29. PROGRAM FLOWCHART SYMBOLS: BEGIN OR END DIRECTION PROCESS DECISION INPUT OR OUTPUT SUBROUTINE MANUAL OPERATION CONNECTOR
  • 30. PROGRAM FLOWCHART: PROCESS A PROCESS B SEQUENCE PROCESS C PROCESS D R TRUE SELECTION PROCESS E S TRUE ITERATION
  • 31. This flowchart shows the software development cycle. You basically design the system, code it and test it. When an error is found, it must be determined whether the error is a design error or not. Coding errors can quickly be fixed, but design errors may take longer. 
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