  J. Albrecht`s Function Point Analysis (FPA) is a method to determine the
functional size of software products. An organization called International
Function Point Users Group (IPFUG), considers the FPA as a standard in the
software functional size measurement. The Albrechts method is followed by IPFUG
method which includes some modifications in order to improve it. A limitation
of the method refers to the fact that FPA is not sensitive enough to
differentiate the functional size in small enhancements. That affects the
productivity analysis, where the software product functional size is required.
To provide more power to the functional size measurement, A. Abran, M. Maya and
H. Nguyeckim have proposed some modifications to improve it. The IPFUG v 4.1
method which includes these modifications is named IFPUG v 4.1 extended. In
this work we set the conditions to delimiting granular from non granular
functions and we calculate the static calibration and sensitivity graphs for
the measurements of a set of projects with a high percentage of granular
functions, all of then measured with the IFPUG v 4.1 method and the IFPUG v 4.1
extended. Finally, we introduce a statistic analysis in order to determine
whether significant differences exist between both methods or not.
