Stammering or a speech disorder involving three factors: (1) dysfluency with repetition of words and parts of words, prolongations of sounds, interjections of sounds or words, and long pauses; (2) listener reaction, considering the dysfluency to be abnormal or unacceptable; and (3) the speaker's reaction to the dysfluency and to the listener's reaction, with a self-conception as a stutterer.