This menu item is only activated for multi-layer systems.
In a multi-layer system it is possible to have the program search for the most unfavourable slip surface. You will see the following dialog box for specifying search criteria.
If you close this box by pressing "OK" the program performs the calculation and then displays the result of the search in a message box.
If you click "Yes" the position of the slip surface is adopted in the "System parameters" dialog box and drawn in the system visualisation at the identified depth.