On the basis of well-known dependence fretting process from the sliding amplitude [1], experiments was performed in order to verify the dependence of fretting process upon the slip amplitude. The reason is that the dependence of the fretting process from the sliding amplitude has been critically reviewed [2], [3]. One of the main critical point was that [1] did not consider the difference between the real displacement amplitude and the imposed amplitude due to compliances of the test rigs. The experimental data used for the considerations reported in [1] were actually based on the imposed displacement amplitude instead to the real sliding amplitude.