The load distribution in the axial direction of cylindrical gears can be calculated very efficiently according to the calculation method ISO 6336 Annex E (module ZA35). The basis for the load distribution calculation of cylindrical gears is the shaft deformation. While Part 1 of the ISO Norm 6336 does provide only rough classifications for shaft deflection, the Annex E allows to specify the exact value - manually or in KISSsys. The accurate determination of the load distribution forms the basis for an appropriate tooth correction. In the advanced training courses of KISSsoft tooth corrections are covered extensively.