Abstract
A systematic approach to software size estimation is important for accurate project planning. In this paper, we will propose the unified mapping of UML models into function points. The mapping is formally described to enable the automation of the counting procedure. Three estimation levels are defined that correspond to the different abstraction levels of the software system. The level of abstraction influences an estimate's accuracy. Our research, based on a small data set, proved that accuracy increases with each subsequent abstraction level. Changes to the FPA complexity tables for transactional functions will also be proposed in order to better quantify the characteristics of object-oriented software.
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