252 Part (Ipower web hosting) III: Executing Your Software Project Plan
252 Part III: Executing Your Software Project Plan Implementing a weighting system Any screening and evaluation system you use should incorporate a weighting system. A weighting system looks at all the criteria. Some features of an application may be considered absolutely essential for your use, while others may not be as necessary. Those features deemed essential should have greater weight than other functions so that as you investigate and rank the vendor proposals, the essential functions play a larger role in determining the outcome of your selection process than the less important functions. In systems using a weighting function, the various requirements of the system are assigned numeric values indicating how each evaluator sees the system meeting the particular feature. That number is then multiplied by a weighted factor to arrive at the true value of that feature in relationship to the other features in the system. The weighting factor is generally a percentage of 1, so that if a weight is .4, that value is seen as more important to the overall value of the system than a feature that is weighted as .2. In theory, all the features should be assigned a numeric value related to how well the evaluator perceived the feature to fulfill its function. The numbers would be multiplied by their weighting factor; then those outcomes would be totaled to provide a single numeric rating for the software testing system. See Table 12-1 for an example of what you may see in a weighting system that you might use during vendor demonstrations. Table 12-1 Weighting System Vendor: Testy McTesty Demonstration Item Weight (0 0.5) Your Score (0 5) Total Ease of use 0.5 5 2.5 System security 0.4 5 2.0 User configuration 0.4 4 1.6 On-site support 0.5 3 1.5 Vendor experience 0.2 5 1.0 Documentation 0.3 3 0.9 Interfaces 0.4 4 1.6 TOTAL 11.1
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