Sociolinguistics as a field distinct from dialectology was pioneered through the study of language variation in urban areas. Whereas dialectology studies the geographic distribution of language variation, sociolinguistics focuses on other sources of variation, among them class. Class and occupation are among the most important linguistic markers found in society. One of the fundamental findings of sociolinguistics, which has been hard to disprove, is that class and language variety are related. Members of the working class tend to speak less standard language, while the lower, middle, and upper middle class will, in turn, speak closer to the standard. However, the upper class, even members of the upper middle class, may often speak 'less' standard than the middle class. This is because not only class but class aspirations, are important.
Class aspiration
Studies, such as those by William Labov in the 1960s, have shown that social aspirations influence speech patterns. This is also true of class aspirations. In the process of wishing to be associated with a certain class (usually the upper class and upper middle class) people who are moving in that direction socio-economically will adjust their speech patterns to sound like them. However, not being native upper-class speakers, they often hypercorrect, which involves overcorrecting their speech to the point of introducing new errors. The same is true for individuals moving down in socio-economic status.
In any contact situation, there is a power dynamic, be it a teacher-student or employee-customer situation, this power dynamic results in a hierarchical differentiation between languages.
Social language codes
Basil Bernstein, a well-known British socio-linguist, devised in his book, 'Elaborated and restricted codes: their social origins and some consequences,' a method for categorizing language codes according to variable emphases on verbal and extraverbal communication. He claimed that factors like family orientation, social control, verbal feedback, and possibly social class contributed to the development of the two codes: elaborated and restricted.
Restricted code
According to Basil Bernstein, the restricted code exemplified the predominance of extraverbal communication, with an emphasis on interpersonal connection over individual expression. His theory places this code within environments that operate according to established social structures that predetermine the roles of their members, in which the commonality of interests and intents due to a shared local identity creates a predictability of discrete intent and therefore a simplification of verbal utterances. Such environments may include military, religious, and legal atmospheres, criminal and prison subcultures, long-term married relationships and friendships between children. Due to the strong bonds between speakers, explicit verbal communication is often rendered unnecessary and individual expression irrelevant. However, simplification is not a sign of a lack of intelligence or complexity within the code; rather, communication is performed more through extraverbal means (facial expression, touch, etc.) in order to affirm the speakers' bond. Bernstein notes the example of a young man asking a stranger to dance: there is an established manner of asking, and yet communication is performed through physical graces and the exchange of glances. As such, implied meaning plays a greater role in this code than in the elaborated code. Restricted code also operates to unify speakers and foster solidarity.
Elaborated code
Basil Bernstein defined 'elaborated code' according to its emphasis on verbal communication over extraverbal. This code is typical in environments where a variety of social roles are available to the individual, to be chosen based upon disposition and temperament. Most of the time, speakers of elaborated code utilize a broader lexicon and demonstrate less syntactic predictability than speakers of restricted code. The lack of predetermined structure and solidarity requires explicit verbal communication of discrete intent by the individual in order to achieve educational and career success. Bernstein notes, with caution, the association of this code with upper classes (while restricted code is associated with lower classes), where the abundance of available resources allows persons to choose their social roles, warning, however, that studies associating the codes with separate social classes used small samples and were subject to significant variation. He also asserts that elaborated code originates due to differences in social context rather than intellectual advantages; as such, elaborated code differs from restricted code according to the context-based emphasis on individual advancement over assertion of communal bonds.
The codes and child development
Bernstein explains language development according to the two codes in light of their fundamentally different values. For instance, a child exposed solely to restricted code learns extraverbal communication over verbal, and therefore may have a less extensive vocabulary than a child raised with exposure to both codes. While there is no inherent lack of value to restricted code, a child without exposure to elaborated code may encounter difficulties upon entering formal education, in which standard, clear verbal communication and comprehension is necessary for learning and effective interaction both with instructors and other students from differing backgrounds. As such, it may be beneficial for children who have been exposed solely to restricted code to enter pre-school training in elaborated code in order to acquire a manner of speaking that is considered appropriate and widely comprehensible within the education environment.
Additionally, Bernstein notes several studies in language development according to social class. In 1963, the Committee for Higher Education conducted a study on verbal IQ that showed a deterioration in individuals from lower working classes ages 8-11 and 11-15 years in comparison to those from middle classes (having been exposed to both restricted and elaborated codes). Additionally, studies by Bernstein, Venables, and Ravenette, as well as a 1958 Education Council report, show a relative lack of success on verbal tasks in comparison to extraverbal in children from lower working classes (having been exposed solely to restricted code).
Covert prestige
It is generally assumed that non-standard language is low-prestige language. However, in certain groups, such as traditional working-class neighborhoods, standard language may be considered undesirable in many contexts. This is because the working class dialect is generally considered a powerful in-group marker, and especially for non-mobile individuals, the use of non-standard varieties (even exaggeratedly so) expresses neighborhood pride and group and class solidarity. There will thus be a considerable difference in use of non-standard varieties when going to the pub or having a neighborhood barbecue (lower), and going to the bank (higher) for the same individual.