The paper is concerned with the generalization ofFeynman’s method. A real “probability” measure is introduced for weighting trajectories and this is expressed as the boundary case of a measure containing one real parameter. For the finite values of the real parameter an equation of motion of the Fokker-Planck type is used. In the zero boundary case a Schrodinger equation is derived. A simple deduction is given for theWigner phase space distribution by using the differentiability of quantum trajectories, which is also proved. It is suggested that the equations of motion obtained for the finite values of the real parameter included in the theory describe real processes.