Intersism it's a software designed to make the entire processing of seismic data coming from a refraction seismic method acquisition. The software extract data directly from the file SEG2 format, SEGY or SU - and give you the possibility to put directly the first arrival picking time. Intersism can manage up to 9 'shots', three inside the line. The composition of the dromocrones is processed finding an analytic minimum, that let you to recognise the ones that are closer to the correlations between first arrival time previously determinated. Than the software used the GRM method to design the geometry of the subsoil layers.