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Getting Results from Software Development Teams by Lawrence J. Peters and Lawrence Peters

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The Cost Variance Method

One thing that you can count on in a software project is that the requirements will change. There are many reasons for this, including changes in the marketplace or the competition, or simply that the customer has rethought the content of the product. One factor not considered by most of the estimation schemes we have discussed is the cost, occurrence, and likelihood of requirements changes.

An approach for computing cost variance used in the construction industry can help us compute an approximate value for the variance in cost estimate caused by changes, delays, and bug fixing (Touran, 2003). First, we need to understand that, even with little or no change from the original estimate, there will be some degree of uncertainty ...

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