As a contribution for efficient and scientific planning of the development of working power through mathematical modelling one starts in this paper by assuming homogeneous sets of working powers. For the process of planning such sets there is given a regulating circuit with feedforwardcontrol. For the simulation of the influence of disturbance the author develops models as discrete MARKOFF-processes. The main problem, consisting in the mathematical modelling of the reference input is demonstrated taking:as example the set ,,teacher of general educating schools in the GDR".