ITPEC FE Morning October 2018 Question 54
Which of the following is an appropriate cost estimation technique that uses parametric models to create an objective estimate based on each element size and the complexity of the system (e.g., number of input files, screens, etc.) to be built?
Explanation
Function point method — it counts the system's functions (inputs, outputs, files, inquiries, interfaces), weights them by complexity and turns the total into size and cost.
Each function type is counted and classed as simple, average or complex, and each class has a fixed weight. The weighted total, adjusted for general system characteristics, gives the function points, and a productivity rate converts them into effort and cost. Because the counts come from the requirements, the estimate is objective and can be made before any code exists.
Answer (c)
Why not others:
- •(a) Analogous estimating — scales the actual cost of a similar past project, a top-down judgment rather than a count of elements
- •(b) Bottom-up estimating — estimates each work package of the WBS and sums them, based on the work to be done rather than a parametric model
- •(d) Three-point estimating — combines optimistic, most likely and pessimistic values to handle uncertainty; it does not measure system size
Key rule: An estimate driven by counting what the system does, weighted by complexity, is the function point method; one driven by past projects is analogous, and one driven by work packages is bottom-up.
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