Pragmatics is the study of the social use of language. It examines how people understand and produce communicative acts in real world situations. Speakers will style shift depending on the context of their talk. The form of utterances can be varied by altering morphology, syntax, vocabulary and phonology. The ability to consciously shift the style of speaking to suit the occasion is important in social contexts. This ability may be reduced in people with communication difficulties.
There are many stuttering problems for people who stutter. People with an established stutter are aware of the negative effect of repetitions, prolongations, hesitations and blocks on their speech. Their stutter (stammer) may be accompanied by facial tics and uncontrolled body movements. Stuttering can lead to the avoidance of certain activities and to social isolation.