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Phase 3 - Design
Phase 3 - Design
In Phase 3, design, the system analyst designs a new or
alternative information system:
- The design is developed to meet the information needs of
the system analysis (phase 2)
- The design phase consists of three tasks:
- Design alternative systems
- Select best alternative
- Write system design report
Designing Alternative Systems
- More than one design can be developed to meet information
needs.
- Each alternative system would be evaluated for:
- Economic Feasibility
Will the costs of the new system be justified by the benefits it
promises?
- Technical Feasibility
Are reliable hardware, software, and training available to make the
system work?
- Operational Feasibility
Can the system actually be made to operate in the organization, or
will people resist it?
Selecting the Best Systems
- When choosing the best design, managers must ask:
- Will the system fit in with the organization's overall
information system?
- Will the system be flexible enough so it can be
modified in the future?
- Can it be made secure against unauthorized use?
- Are the benefits worth the costs?
Writing the Systems Design Report
- The report is prepared for higher management.
- The report would describe:
- The costs versus the benefits.
- The effect of alternative designs on the organization.
- Recommendation for one of the alternatives.
- The report usually concludes with a recommendation by the
system analyst for one of the alternatives.
- After reading the report of the design phase, management
decides which system they want the system analyst to develop in phase 4.
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