In several books on control theory (e.g. Föllinger: "Regelungstechnik") the Frobenius decomposition is described as a method for determining the state space model out of the Laplacian form of the transfer function. In those books it is described for one input variable U(s) and its transfer function G(s).The following calculation instruction is evolved to fractionize a transfer function with the sum of two input variables and their transfer functions into state space.