1. A method for determining a model of an interface between a user and his environment on board a vehicle, characterized in that it includes the following steps: construction (E 1 ) of an interface model on the basis on the one hand, of a first type of information representative of interface elements of the vehicle and, on the other hand, of a second type of information representative of the knowledge that a user has concerning the use of interface elements. acquisition (E 2 ) of data representative of at least one human activity which is sought during the interaction between the user and these interface elements, the acquisition of these data being achieved by means of at least one data-acquisition apparatus, analysis (E 3 ) of the data thus acquired, adjustment (E 4 ) of the interface model as a function of the data analysis.