The invention relates to a process for determining the activation of at least one key of a multi-key device. The multi-key device comprises a plurality of keys K1 to Kn and a plurality of force sensors C1 to Cn, each force sensor C1 to Cn being associated respectively with a key K1 to Kn and able to provide a value representing a force which is applied to it. The process is characterized by the fact that it comprises the steps: obtaining values F′1 to F′n representing the force applied to each of the force sensors C1 to Cn; providing transmission rate values of a pressing force between the keys; removing the contribution of each of the force values F′1 to F′n from the pressing force transmitted between the keys using the transmission rate values provided; and determining values F1 to Fn representing the pressing force which has been applied by the user to the keys K1 to Kn.