CostEstimation - Cost Estimation Van Vliet, chapter 7 Glenn...

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Cost Estimation Van Vliet, chapter 7 Glenn D. Blank
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Cost estimates: when and why When does a contractor estimate costs for building a house? Before construction begins, let alone payment Takes into account subcontracts for foundation, framing, plumbing, electrical, etc. Hierarchy, modularity and abstraction support estimates Who benefits from these cost estimates? Can cost estimates have similar advantages for software projects? On the other hand, can cost estimates for software projects be as accurate as for house contracts? Why or why not?
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Person-months Most software cost estimates assume cost = effort Effort = man-month, i.e., a person’s work for a month Usually ignores cost of hardware or cost of maintenance Fred Brooks, The Mythical Man-Month , 1975: “Cost does indeed vary as the product of the number of men and the number of months. Progress does not. Hence the man-month as a unit for measuring the size of a job is a dangerous and deceptive myth. It implies men and months are interchangeable.” “Men and months are interchangeable commodities only when a task can be partitioned among many workers with no communication among them. This is true of reaping wheat or picking cotton; it is not even approximately true of systems programming.” “Adding manpower to a late project makes it later.”
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This note was uploaded on 08/06/2008 for the course CSE 432 taught by Professor Blank during the Fall '08 term at Lehigh University .

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CostEstimation - Cost Estimation Van Vliet, chapter 7 Glenn...

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