Abstract: The invention relates to an interface (12) for dialogue between a user and an interactive terminal (10), especially a parking meter for a motor vehicle, comprising at least one selection element (30) enabling the user to choose the value of at least one parameter from an associated list of values, a validation element (30) enabling the user to validate his or her choice, a canceling element (32) enabling the user to cancel a choice, and a display screen (16) enabling the user to visualize the value of the parameter, wherein the interactive terminal (10) performs an operation which is determined according to the choice of the parameter, characterized in that the selection element (30) also forms the validation element.