Communication accommodation theory (CAT) is a theory of communication developed by Howard Giles. This theory concerns "(1) the behavioral changes that people make to attune their communication to their partner, (2) the extent to which people perceive their partner as appropriately attuning to them." The basis of the theory lies in the idea that people adjust (or accommodate) their style of speech to one another. Doing this helps the message sender gain approval from the receiver, increases efficiency in communication between both parties, and helps the sender maintain a positive social identity. This theory is concerned with the links between language, context, and identity. It focuses on both the intergroup and interpersonal factors that lead to accommodation, as well as the ways that power, macro and micro-context concerns affect communication behaviors. Accommodation is usually considered to be between the message sender and the message receiver, but the communicator also often accommodates to a larger audience- either a group of people that are watching the interaction or society in general.