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Systems Development Life-Cycle |
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Methodologies |
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Commercial Alternatives |
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Initial Investigation (Feasibility) |
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Systems Analysis |
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Systems Design |
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Systems Development (Programming) |
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Testing |
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Implementation |
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Use |
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Maintenance |
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Economic |
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Years to Breakeven |
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Return on Investment |
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Technical |
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Physical requirements |
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HR requirements |
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Operational |
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Business needs |
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Interface with other systems |
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A marketing rep suggests your company create a
data warehouse that would list perspective customers. He asserts such a list would increase
sales 20% and profits 20% (about $60K/yr).
Your quick analysis shows the hardware and software purchase costs
will be $100,000 with license fees of $12,000 after the first year. Is it feasible? |
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Review current system |
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Review current business processes |
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Examine proposed changes |
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Methods:
error reports, company records, observation, interviews, benchmarks
and best practice models |
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System inputs, outputs, and user interfaces |
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Description of hardware, software, databases,
networks, personnel, and procedures |
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System integration detail |
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Build |
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Programming tools |
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Modular design |
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Reuse |
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Purchase |
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RFP |
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Checklist/benchmarks/points |
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Modular testing |
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Integrative testing |
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Test sets |
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Beta releases |
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Installation, training, use |
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Phased |
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Parallel |
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Direct |
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Corrective |
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Perfective |
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Adoptive |
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The integration challenge – adjustments to
versions of off-the-shelf software – “vanilla implementations” |
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Prototyping |
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JAD |
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RAD |
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ICASE |
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OOPs |
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End-user computing |
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Speed and knowledge vs connectivity and
standards |
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External Acquisition |
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Increasing supply of off-the-shelf systems |
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Adjusting local processes to business standards |
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Outsourcing |
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Core competencies |
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Local control |
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Access to expertise |
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Notes