Different Approaches To Sys Bldg

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 ,[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],[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

When to Outsource? ,[object Object],[object Object],[object Object]

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]

Different Approaches To Sys Bldg

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Different Approaches To Sys Bldg