System Strategy

System Strategy - Development Strategies Agenda Software...

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Development Strategies
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Agenda Software Packages In-house Development Outsourcing Business Process Reengineering (BPR) Prototyping
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Purchase Software Canned software: written by computer manufacturers or software development companies Sold on open market to broad range of users with similar requirements Turnkey systems : combination of software and hardware sold as a package
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Purchasing Software Companies that buy rather than develop AIS software still go through systems development life cycle (SDLC) Implementation phase is reduced: less coding less testing This is most costly SDLC phase
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Systems Acquisition Process Will package meet needs ? Develop software internally Send RFP for hardware, if necessary Evaluate proposal No Yes Investigate software packages Can package be modified ? Send RFP for software and hardware No Yes Select best combination
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Alternative Screening Matrix Use for screening, not selection Beware of implying too much accuracy
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Alternative Screening Matrix Evaluation Criteria Crit. Weight Alternatives to be Compared A1 A2 An . . . . 1.00 Total T1 T2 Tn C1 C2 Cm . . . M Evaluation Criteria N Alternatives Wc1 Wc2 Wcm . . . . . . .
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Determining Weights Rank factors in importance with most important receiving highest number Total the ranks Divide each factor weight by the total Make individual weight adjustments if necessary
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Weighting Example CRITERIA CRITERIA RANK RANK CALCULATION CALCULATION WEIGHT WEIGHT Cost Cost 4 4 4/15 4/15 .27 .27 Scalability Scalability 2 2 2/15 2/15 .13 .13 Ease of Use Ease of Use 5 5 5/15 5/15 .33 .33 Service Service 3 3 3/15 3/15 .20 .20 Upgrades Upgrades 1 1 1/15 1/15 .07 .07 TOTAL 15 TOTAL 1.00 Most important criterion gets highest rank. In most Cases, you need reverse the given ranks.
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Weighting Example CRITERIA CRITERIA A A B B C C Cost Cost 2 2 4 4 2 2 Scalability Scalability 2 2 2 2 3 3 Ease of Use Ease of Use 2 2 5 5 3 3 Service Service 3 3 3 3 2 2 Upgrades Upgrades 1 1 2 2 5 5 Assign score to each option for each criterion On a five point scale. This info is usually given
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Weighting Example CRITERIA CRITERIA A A B B C C Cost Cost 2 X .27 2 X .27 4 X.27 4 X.27 2 X. 27 2 X. 27 Scalability Scalability 2 X .13 2 X .13 2 X. 13 2 X. 13 3 X. 13 3 X. 13 Ease of Use Ease of Use 2 X .33 2 X .33 5 X. 33 5 X. 33 3 X. 33 3 X. 33 Service Service 3 X .20 3 X .20 3 X. 20 3 X. 20 2 X. 20 2 X. 20 Upgrades Upgrades 1 X. 07 1 X. 07 2 X. 07 2 X. 07 5 X. 07 5 X. 07 TOTAL 1.59 3.19 2.88
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Alternative Screening Matrix Example: Vendor A score 4.35 Vendor B score 4.25 Vendor C score 3.25 Vendor C out; Vendors A and B too close to call
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System Strategy - Development Strategies Agenda Software...

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