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Modern Systems Analysis and Design Third Edition
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  1. Modern Systems Analysisand DesignThird Edition Chapter 11 Selecting the Best Alternative Design Strategy 11.1

  2. Selecting the Best Alternative Design Strategy • Two basic steps • Generate a comprehensive set of alternative design strategies • Select the one design strategy that is most likely to result in the desired information system • Process • Divide requirements into different sets of capabilities • Enumerate different potential implementation environments that could be used to deliver the different sets of capabilities • Propose different ways to source or acquire the various sets of capabilities for the different implementation environments 11.2

  3. Selecting the Best Alternative Design Strategy • Deliverables • At least three substantially different system design strategies for building the replacement information system • A design strategy judged most likely to lead to the most desirable information system • A Baseline Project Plan (BPP) for turning the most likely design strategy into a working information system 11.3

  4. Generating Alternative Design Strategies • Best to generate three alternatives • Low-end • Provides all required functionality users demand with a system that is minimally different from the current system • High-end • Solves problem in question and provides many extra features users desire • Midrange • Compromise of features of high-end alternative with frugality of low-end alternative 11.4

  5. Drawing Bounds on Alternative Designs • Minimum Requirements • Mandatory features versus desired features • Forms of features • Data • Outputs • Analyses • User expectations on accessibility,responsetime 11.5

  6. Drawing Bounds on Alternative Designs • Constraints on System Development • Date when system is needed • Financial and human resources • Elements of the system that cannot change • Legal and contractual considerations 11.6

  7. Issues to Consider in Generating Alternatives • Outsourcing • The practice of turning over responsibility of some to all of an organization’s information systems applications and operations to an outside firm • Can provide a cost effective solution 11.7

  8. Issues to Consider in Generating Alternatives • Sources of Software • Hardware manufacturers • Packaged software producers • Custom software producers • Enterprise solution software • Application Service Providers • In-house development 11.8

  9. Criteria for Choosing Off-the-Shelf Software • Cost • Functionality • Vendor Support • Installation • Training • Technical Support • Viability of Vendor 11.9

  10. Criteria for Choosing Off-the-Shelf Software • Flexibility • Ease of customization • Response Time • Ease of Installation 11.10

  11. Validating Purchased Software Information • Information from vendor • Request for proposal • A document provided to vendors to ask them to propose hardware and system software that will meet the requirements of your new system • Software evaluation period • Customer references from vendor • Independent software testing service 11.11

  12. Hardware and Software Issues Existing Platform • Lower costs • Information system staff is familiar with operation and maintenance • Increased odds of successfully integrating system with existing applications • No added costs of converting old systems to new platform or transferring data New Hardware and System Software • Some software components will only run on new platform • Developing system for new platform gives organization opportunity to upgrade technology holdings • New requirements may allow organization to radically change its computing operations 11.12

  13. Updating the Baseline Project Plan (BPP) • The Baseline Project Plan (BPP) was developed during project initiation and planning • Baseline Project Plan (BPP) can be used as an outline of a status report at analysis phase • Schedule will be updated to reflect actual activities and durations • An oral presentation of project status is typically made at this phase 11.13