A method of optimizing shifting of a shifting element which fixes a shaft to another component of the drive-train. Three shifting processes are influenced by respective characteristic forms of a control parameter. The first and second characteristic forms are different from one another. Each shifting process has a distinct start and end time (tBeginn, tEnde). The rotational speed of the shaft is a function n(t) of time t. An idealized rotational speed nideal(t):=G{n(t)} is determined by a filter G. First and second evaluation indexes I:=I(t−Δt,t)/I (tBeginn−t, tBeginn) are calculated, in which tBeginn