||This study has as a target the experimental introduction of a software methodology in forensic expertise of the period concerning conception of children in the paternity research. The following standard methods had been used in this research: the methodology of forensic expertise to design limited range of conception period for minors in research paternity, the establishment of possible period of conception, the calculation of the probability to conceive at a time of coexistence already indicated, the calculation of the probability to conceive before or during the start of cohabitation, the calculation of the probability to conceive after the start of cohabitation developed by the National Institute of Forensic Medicine ,,Mina Minovici” Bucharest. For the data and calculation formulas entry in the program the parameters we used were the data from tables on intrauterine growth, obtained by processing mathematical tables and curves of Lubchenco for rapid determination of the statistical average duration of pregnancy and its limits. The main advantage is speed in obtaining results and removing human error factor in the process of calculation, by replacing it with software. The software was developed in .NET, creating a simple interface through which can be calculated easily, using a mathematical algorithm, to determine the probability for possible period of conception of minors in paternity research
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