[…] there may be appreciable linguistic differences in a person’s talk in different social situations ( e.g., in some societies, in talk to equals or to superiors).
- Harris (1951), a pag.13

Some phonetic features occur regularly in particular social situations: in sufficiently stratified societies there are recognizable differences between the way a, say, upper middle class woman talks to a social equal and to a servant (even when the utterance is otherwise identical). Other features may be present in all the speech of a particular person during several years of his life, witness the fact that we can recognize a person by his voice. Still others characterize the members of a particular age group, social class, etc., witness the fact that in certain cases we can tell the class or age group of a speaker before we see him.
- Harris (1951), a pag.55

If each utterance is correlated with the social situation, i.e. the cultural environment and the interpersonal relations, in which it occurs, it will be possible to correlate the morphemic segments of the utterance with features of the social situation.
- Harris (1951), a pag.172