However, the decision about accommodation is not always necessary.
If two strangers meet, they may have a random small talk and simply say goodbye.
Particularly, it focused on the cognitive and affective processes underlying individuals' convergence and divergence through speech.
There are four main socio-psychological theories: The similarity-attraction theory posits that "The more similar our attitudes and beliefs are to those of others, the more likely it is for them to be attracted to us." An individual on the receiving end of high level of accommodation is likely to develop a greater sense of self-esteem and satisfaction than being a receiver of low accommodation. states that prior to acting, we attempt to assess the rewards and costs of alternate courses of action", and that we tend to choose whatever course of action will bring greater rewards and less costs.Although most often convergence can bring forth rewards, there are some occasions when it can also bring forth costs such as "increased effort to converge, a loss of perceived integrity and personal (and sometimes group) identity".The causal attribution theory "[s]uggests 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.In this experiment, when individuals believed that the person from the different group used language convergence to reduce cultural barriers, they evaluated it more positively than when they attributed it to the pressures of the situation."When French Canadian listeners attributed an English Canadian's convergence to French as due to his desire to break down cultural barriers, the shift was viewed favorably.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 that they share with each other, the more likely for them to accommodate.Those expectations give guidance to people's behaviors, helping them to figure out the appropriate way to accommodate.Most of the time, the accommodation made according to those norms are perceived socially appropriate.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.These theories help to explain why speakers seek to converge or diverge from the language, dialect, accent and behavior of their interlocutors. This latter theory argues that a person's self-concept comprises a personal identity and a social identity, and that this social identity is based in comparisons people make between in-groups (groups they belong to) and out-groups (groups they do not belong to).