SYSTEMSDESIGNANALYSIS 1 Chapter 13 The Systems Proposal Jerry Post Copyright © 1997.
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1 S S Y Y S S T T E E M M S S D D E E S S I I G G N N A A N N A A L L Y Y S S I I S S Chapter 13 Chapter 13 The Systems Proposal Jerry Post Copyright © 1997
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SYSTEMSDESIGN 3 Inventory Equipment Type of equipment Manufacturer Model Number CPU Storage Input Output Networks Status Estimated age Projected life Physical location Department responsible Financial purchase/lease
Transcript of SYSTEMSDESIGNANALYSIS 1 Chapter 13 The Systems Proposal Jerry Post Copyright © 1997.
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AANNAALLYYSSIISS Chapter 13Chapter 13
The Systems Proposal
Jerry PostCopyright © 1997
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Determine Hardware RequirementsDetermine Hardware Requirements
Inventory existing hardware. Estimate workloads. Evaluate hardware vendors. Purchase or lease?
InventoryComputerHardware
EstimateWorkloads
EvaluateSoftware
EvaluateHardware
ChooseVendor
ChooseVendor
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Inventory EquipmentInventory Equipment
Type of equipment Manufacturer Model Number CPU Storage Input Output Networks
Status Estimated age Projected life Physical location Department responsible Financial purchase/lease
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Estimating WorkloadsEstimating Workloads
Existing System Proposed SystemTask Monthly summary of
shipments to distributionwarehouse
Same
Method Manual ComputerPersonnel Distribution Manager Computer OperatorCost/Hour $20.00 $10.00When and How Daily: Files shipping receipts
for each warehouse.Monthly: Summarizes dailyrecords using calculator andprepares report
Daily: Runs programthat totals shipmentsand writes to disk.Monthly: Runs programthat summarizes andprints reports.
Human Time Daily: 20 minutesMonthly: 8 hours
Daily: 4 minutesMonthly: 20 minutes.
Computer Time None Daily: 4 minutesMonthly: 20 minutes
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Estimating WorkloadsEstimating Workloads
Benchmarks Experience with similar
systems. User groups. Trials on vendor hardware. Number of users! Expansion and upgrades. Product life cycle
Common: 3 years Stretch: 5 years
Price/Performance Price drops over time New machine is introduced
Higher price Better performance
Time
Sales
PentiumPentium Pro
1997
Time
Price/performance
PentiumPentium Pro
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Lease versus BuyLease versus Buy
Ownership Control Lock-in
Up-front costs Maintenance Depreciation Net present value
Time
Lease: Costs
Time
Buy: Costs
iii
rCostPV
)1(
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Software EvaluationSoftware Evaluation
Effectiveness Perform all required tasks Future tasks? Capacity
Efficiency Response time Data entry Data storage
Ease of Use User interface Help system
Flexibility Documentation Support
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Forecasting Costs and BenefitsForecasting Costs and Benefits
Benefits Improved sales Decreased expenses Better decisions
Costs Hardware Software Operations
Regression Y = b0 + b1X1 + b2X2 + … Dependent (Y) Independent (X.) Find line that best fits the
data points. Moving Average
Time
Sales
Newsystem
Oldsystem
Time
Sales
