Researchers have a variety of speculations about why stuttering or stammering occurs in some people. However, the exact cause of this speech condition is still unknown today. What researchers are sure of is that there are factors that may influence a person’s inability to speak fluently.

It is an intensive interval therapy program for people who stutter. First conducted in 1987 Germany, this therapy program was named after Van Riper from whom it took several of its basic underlying principles of treatment.

It is called the Van Riper Program as Intensive Interval Therapy. It is called interval because of its block schedule system—a five-day duration of segments with six to eight weeks between the segments. It is called intensive because of its long period of session during segments—about eight hours a day.