Y-GUI V1.0 initially was coded by O.K. Mahabadi in April 2008. Further development was carried out in May 2008 leading to V2.0 of the program. Many more features, including importing meshes from Abaqus, automatic material layering, import of initial conditions from a .yres file, and displaying node / element numbers have been added to the code in 2009 (versions 2.x).