IX1D v3 performs forward and inverse modeling in terms of a layered earth with resistivity and optional IP parameter for most sounding methods (DC, FEM, TEM, MT, EM Conductivity). IX1D v 3 also does smooth modeling in terms of many layers and equivalence analysis of the inverted layered model. It also allows for well log viewing, reduction and plotting. IX1D v3 can hold many soundings in its data base. It supports import of profiles as well as creation of profiles from imported soundings.