Don't you just dread being asked the question, "How long will the modeling take?" I usually react to this question with another question: "How much time are you giving me?" Often, however, it comes down to me rolling up my sleeves and coming up with an estimate. I have noticed over the years that my estimates hover somewhere between 20 and 40 percent of the overall project effort. (Note that the 20 percent estimate is given rarely - only when the requirements are very well defined and the modeling and mappings are relatively simple.) What techniques do you use to estimate the modeling portion of your projects?
After determining the resources that will be provided to us and clarifying which artifacts the data modeler will be responsible for delivering, we can apply an equation to come up with a reasonable estimate to complete the data models.
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