Fretting is a wear mechanism resulting from the reciprocating displacement at small amplitudes, and is taking place in many technical systems. The normal load and the relative displacement amplitude of the tribo-pairs are known to be the operational parameters with the stronger effect on fretting, as load is the main parameter that determines contact dimension, while the stroke value can change the fretting regime. Thus, in order to study the fretting behaviour of W-Si-N coatings, a set of tests was carried out focussing on these variables. Three levels of normal load were applied to the sphere-on-flat contact: 5, 10 and 3 0 N. For each normal load, the fretting stroke was varied from 1 to 10 mum. During the performed tests, the: tangential force and the relative displacement of the tribo-pairs were recorded to build the resulting fretting cycles. The fretting loop shape, the dissipated energy and the morphology of the wear scars allowed the identification of the fretting regime occurring for each test condition. All three characteristics of the fretting contact regimes were identified: the "stick" regime, the "partial slip" regime and the "gross slip" regime.