In Function Point Analysis (FPA), the Value Adjustment Factor ($VAF$) is calculated from 14 General System Characteristics ($GSC$) using:
A$VAF = 0.50 + 0.05 imes sum GSC$
B$VAF = 0.65 + 0.01 imes sum GSC$
C$VAF = 1.0 + sum GSC$
D$VAF = 0.10 imes sum GSC$
Explanation
The standard FPA formula scales $VAF$ between $0.65$ and $1.35$ using $VAF = 0.65 + 0.01 imes sum GSC$.

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