The parameters of the earth pressure and the masonry can be adjusted with the various sliders. The geometry of the trapezoidal cross-section can be changed by pulling the corners of the cross-section into the appropriate position. The grid shown has a machine width of one metre.

The foot line is divided into three parts with blue crosses  X. To prevent tipping, the intersection with the resulting force (orange) must be in the middle third. The friction angle of the rock is shown in red. If the resultant force (orange) lies within the red triangle, there is sufficient safety against slipping.