The second assumption is concerned with how people perceive and evaluate a conversation.Perception is the process of attending to and interpreting a message When someone enters a conversation, usually he first observes what takes place and then decides whether he should make adjustment to fit in.People's attitudes and beliefs, derived from those factors, determine the extent to which they are willing to accommodate in a conversation.The more similarities they share with each other, the more likely for them to accommodate.Causal attribution process The causal attribution theory "Suggests that we interpret other people's behavior, and evaluate the individual themselves, in terms of the motivations and intentions that we attribute as the cause of their behavior" It applies to convergence in that convergence might be viewed positively or negatively depending on the causes we attribute to it: "Although interpersonal convergence is generally favorably received, and non-convergence generally unfavorably received, the extent to which this holds true will undoubtedly be influenced by the listeners attributions of the speaker's intent." Giles and Smith provide the example of an experiment that they conducted amongst French and English speaking Canadians to illustrate this.
Like speech accommodation theory, communication accommodation theory continues to draw from social psychology, particularly from four main socio-psychology theories: similarity-attraction, social exchange, causal attribution and intergroup distinctiveness.when members of different groups are in contact, they compare themselves on dimensions that are important to them, such as personal attributes, abilities, material possessions and so forth." Because speech style and language is an important factor in defining social groups, divergence in speech style or language is often used to maintain intergroup distinctiveness and differentiate from the out-group, especially when group membership is a salient issue or the individual's identity and group membership is being threatened.Many of the principles and concepts from social identity theory are also applicable to communication accommodation theory.Since speech is a way to express group membership, people adopt convergence or divergence in communication to "signal a salient group distinctiveness, so as to reinforce a social identity".
Communication accommodation thus, becomes a tool to emphasize group distinctiveness in a positive way, and strengthen the individual's social identity.
The last assumption puts emphasis on social appropriateness and norms. expectations of behaviors that individuals feel should or should not occur in a conversation".