Dialogue has developed from more primitive forms of communication during evolution. In Mutualities in Dialogue, "dialogue" refers to face-to-face interaction between two or more individuals using a system of signs. It asks the question "What is it that we share in the course of a dialogue?", arguing that mutualities of language, culture and some interpersonal information are prerequisite for effective communication. Even in instances of noncooperation or of asymmetrical dialogue elementary commonalities must be present.