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Published byWinfred Daniels Modified over 9 years ago
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Selecting the Best Alternative Class 19
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SDLC Project Identification & Selection Project Initiation & Planning Analysis *** Logical Design Physical Design Implementation Maintenance
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Analysis Steps 1. Requirements Determination 2. Requirements Structuring 3. Alternative Generation & Selection 3a. Functional requirements 3b. Environment 3c. Implementation 4. Review Recommendations with Management
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Deliverables Usually three different alternatives for building the replacement or new information system The alternative judged most likely to lead to the most desirable information system A Baseline Project Plan for turning the most likely alternative into a working information system
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Step 3a: Prioritize Requirements Refine scope Determine level of automation
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Step 3a: Generate and evaluate Functional Requirement alternatives Generate more than one alternative based on functional requirements Typically 3 chosen Bare Bones solution Mid-level solution Bells & Whistles solution
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Choosing the alternatives Reevaluate feasibility Consider constraints: 1. 2. 3. 4. 5.
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Step 3a: Generate and evaluate Functional Requirement alternatives Propose 3 alternatives Select Best On a related note, why might a company decide to end the project at this point?
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Step 3b: Generate and evaluate Environment alternatives Hardware, System software, Networks Development tools
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Step 3c: Generate and evaluate implementation alternatives Outsourcing / Custom-built Packages, Turnkey, ERP In-house
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Outsourcing / Custom built The practice of turning over responsibility of some to all of an organization’s information systems applications and operations to an outside firm Examples:
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Outsourcing: What to consider 1. 2. 3.
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Choosing Off-the-Shelf Software ______________
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How Can We Get Information About a Software Package? _______________________
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In-house development Advantages 1. Disadvantages 1.
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Why are we worrying about implementation alternatives now? Training users Cost Support User acceptance
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Step 4: Review with management How formal? How to compile, organize, and present
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