In this paper we present how to take into account parameters and variables that were not initially present in the bond graph representation of some components. These bond graph considerations are justified mainly by design arguments but from the automatics point of view this is closely related to the state representation concept. We present this idea through the examples of a mechanical spring and a simple thermodynamic system. In each case one solution is to substitute a multiport energy storage element to the initial one port element. It emphasizes the close relationship between the order of this component and the output variables that we want to observe in this component.