Competitors are typically organised into three broad categories: deaf athletes, athletes with a physical disability, and athletes with an intellectual disability. Deaf athletes typically compete among themselves, while athletes with physical and intellectual disabilities are usually assessed and given a para-athletics classification, which groups together athletes with similar ability levels. These classifications are governed by the International Paralympic Committee (IPC) and comprise a single letter and a number: T for Track or F for Field, then a number defining the level of ability. In competition, events may take place between athletes of identical class if numbers are sufficient, otherwise a range of similar classes may compete in the same event. The Raza point score system can be used in field events to allow athletes of different abilities to directly compete.