GATE CSE 2015 Set 3 | Question: 21

Question

Consider a software project with the following information domain characteristics for calculation of function point metric.

Number of external inputs (I) = 30

Number of external outputs (O) = 60

Number of external inquiries (E) = 23

Number of files (F) = 08

Number of external interfaces (N) = 02

It is given that the complexity weighting factors for I, O, E, F and N are 4, 5, 4, 10 and 7, respectively. It is also given that, out of fourteen value adjustment factors that influence the development effort, four factors are not applicable, each of the other four factors have value 3, and each of the remaining factors have value 4. The computed value of function point metric is _________.

Answer 1

Ans: 612.06

FP = UAF * VAF

UAF = 30 * 4 + 60 * 5 + 23 * 4 + 08 * 10 + 02 * 7 = 606

VAF = 0.65 + [4 * 3 + 6 * 4]/100 = 1.01

So, FP = 606 * 1.01 = 612.06

calculations can be done here : http://groups.engin.umd.umich.edu/CIS/course.des/cis525/js/f00/artan/functionpoints.htm

For theory part see this : http://www.softwaremetrics.com/fpafund.htm

Comments

How to Calculate the VAF?

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how this VAF  caclutated ?

kindly explain

VAF = 0.65 + [4 * 3 + 6 * 4]/100 = 1.01

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formula for VAF is 0.65 + [ (Ci) / 100] .i = is from 1 to 14 representing each factor

given

four factors are not applicable,

each of the other four factors have value 3, so 4*3

and each of the remaining factors have value 4

remaining=14-8=6 (since total 14 factors)

6*3

so VAF= 0.65 + [4 * 3 + 6 * 4]/100 = 1.01

Answer 2

Function point metrics provide a standardized method for measuring the various functions of a software application

The value of function point metric = UPF * VAF

Here,
   UPF: Unadjusted Function Point (UFP) count
   VAF: Value Adjustment Factor

UPF  = 4*30 + 60*5 + 23*4 + 8*10 + 7*2 = 606

VAF = (TDI * 0.01) + 0.65

Here TDI is Total Degree of Influence
TDI = 3*4 + 0*4 + 4*6 = 36

VAF = (TDI * 0.01) + 0.65
    = 36*0.01 + 0.65
    = 0.36 + 0.65
    = 1.01

FP = UPF * VAF
   = 1.01 * 606
   = 612.06