Situational variables are factors that may influence communicative behavior. The physical and social surroundings, timing, reasons for communicating and individual physiological and mood states can affect language choice in any particular situation.
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.