 Lewis argues that conventions are solutions to coordination problems. In interactive situations that have more than one equilibrium—for instance, where it is rational for us all to drive on the left or for us all to drive on the right—conventions resolve the question of which actions to choose. In his analysis, convention does not require explicit or tacit agreement, but instead involves the possession of various attitudes by members of the community, including beliefs, knowledge, expectations, and preferences (see the entry on  convention).