Ch7new3-10a - Chapter 7: Selecting the Best Alternative...

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Unformatted text preview: Chapter 7: Selecting the Best Alternative Design Strategy D. Harrison McKnight Eli Broad College of Business Business Essential 2 Know Essential From a written scenario, be able to correctly create a weighted alternative comparison matrix From the weighted alternative comparison matrix, designate the proper alternative Selecting the Best Design Strategy: A Rationale Rationale Each project needs to be evaluated at Each several points during its life-cycle Their scope needs to be assessed for the “Xmas tree effect” Many systems projects should be done—but how Many to do them is often the key to Thus, before one gets into the expensive and Thus, almost irreversible design stages: almost it is best to explore and choose the best design it strategy strategy Selecting a Design Strategy Selecting Last Step in Systems Analysis design ideas, requirements, constraints architectural constraints available in­house resources data & processing requirements requests for proposals Alternative Generation & Selection vendor bids design strategy; updated BPP, schedule, economic feasibility analysis Design Strategy Design High-level High-level statement of the approach to developing the information system developing Includes – – – – Functionality requirements System/project constraints System architecture & platforms Technology acquisition How to Select Design Strategy--Overall How Specify Requirements & Constraints Research & Generate Alternatives Evaluate Alternatives Select “Best” Alternative } Decision Matrix Design Alternatives Design System – – – – Architecture & Platform Centralized, Decentralized, Distributed Input / Output Devices Operating System Platform Off-the-Shelf or Custom Software Technology – – – Acquisition Outsource Custom development by external party In-house development Purchased Software Considerations Purchased Vendor Viability and Vendor Support Functionality + Response time versus Functionality Initial and Ongoing Cost Initial Flexibility of customization Ease of implementation Quality of Documentation Hardware/System Software/Application Hardware/System compatibility compatibility Validating Purchased Software Validating Issue Issue a Request for Proposal (RFP), including customization, installation including Install and use the system in your setup Install your Ask vendor’s customers, ask peers, etc. Independent testing services, SW reviews Ask for performance data, visit user site Features and Constraints Features Features to be considered: to – – – – Data to store in system System outputs (e.g., reports, online displays) Analyses to generate the system outputs Expectations on accessibility, response time Constraints to be considered: – – – – System delivery date Available financial and human resources Legal or contractual restrictions Competitive environment (e.g., proprietary data) Design Alternatives Design Generate three alternatives Low-end alternative – – Conservative, bare-bones, mandatory features only Emphasis on cost savings, but provides some Emphasis functionality functionality High-end – – Forward-looking, bells & whistles (extra features) Emphasis on functionality Middle – alternative alternative Compromise solutions How to Build a Weighted Alternative Decision Matrix Alternative Alternatives (columns) Criteria (rows) – – Requirements Constraints Evaluate – – – Alternatives by Criteria Assign weights to criteria Rate each alternative on each criteria (e.g. 1 to 5) Select alternative with best weighted score Example: Buffalo Burger Inventory Control System Buffalo Requirements – – – Easy entry of shipment Easy information upon shipment arrival shipment Automatic re-order Automatic decisions decisions Real-time inventory Real-time level assessment level Constraints – – – – System development System cost not to exceed $50,000 $50,000 Hardware cost not to Hardware exceed $50,000 exceed Delivery within 6 Delivery months months Minimal training needs Requirements Requirements Easy real­time data entry Automatic re­order decisions Real­time inventory information Constraints Development cost Hardware cost Time to complete Training Alt. A Yes Alt. B Yes Alt. C Yes Partial Yes Yes No Partial Yes $25000 $25000 3 months 1 week $50000 $50000 6 months 2 weeks $65000 $50000 9 months 1 week Requiremts. Requiremts. Data entry Re­order Inv. info. Constraints Dev. cost H’ware cost Time Training Total Weight 18 18 14 50 20 15 10 5 50 100 Alt. A Rating Score Alt. B Rtg Sc Alt. C Rtg Sc Requiremts. Requiremts. Data entry Re­order Inv. info. Constraints Dev. cost H’ware cost Time Training Total Weight 18 18 14 50 Alt. A Rating Score 5 3 1 Alt. B Rtg Sc 5 5 3 Alt. C Rtg Sc 5 5 5 20 15 10 5 50 5 5 5 5 4 4 4 3 3 4 3 5 100 100 100 100 Requiremts. Requiremts. Data entry Re­order Inv. info. Constraints Dev. cost H’ware cost Time Training Total Weight 18 18 14 50 Alt. A Rating Score 5 90 3 54 1 14 158 Alt. B Rtg Sc 5 90 5 90 3 42 222 Alt. C Rtg Sc 5 90 5 90 5 70 250 20 15 10 5 50 5 5 5 5 100 75 50 25 250 4 4 4 3 80 60 40 15 195 3 4 3 5 60 60 30 25 175 100 100 408 100 417 100 425 Sensitivity Analysis—What if more weight on constraints? Requiremts. Requiremts. Data entry Re­order Inv. info. Constraints Dev. cost H’ware cost Time Training Total Weight 14 14 12 40 Alt. A Rating Score 5 70 3 42 1 12 124 Alt. B Rtg Sc 5 70 5 70 3 36 176 Alt. C Rtg Sc 5 70 5 70 5 60 200 24 18 12 6 60 5 5 5 5 120 90 60 30 300 4 4 4 3 96 72 48 18 234 3 4 3 5 72 72 36 30 210 100 100 424 100 410 100 410 Essential 2 Know Essential From a written scenario, be able to correctly create a weighted alternative comparison matrix From the weighted alternative comparison matrix, designate the proper alternative ...
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This note was uploaded on 11/17/2011 for the course ITM 311 taught by Professor Harrisonmcknight during the Fall '10 term at Michigan State University.

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