Sailing is a relatively recent sport at the Paralympic Games. The Atlanta 1996 Paralympic Games introduced Sailing as a demonstration sport, leading to its acceptance as a full medal sport at the Sydney 2000 Paralympics. This sport is open to athletes with an amputation, cerebral palsy, blindness/visual impairment, spinal injuries and les autres. The Sailing classification system is based on four factors - stability, hand function, mobility and vision. Athletes compete in three events, which are non-gender specified: The Single-Person and Three-Person Keelboats are open to most disability groups, while the Two-Person Keelboat event is specifically designed for athletes with a severe disability. The sport is governed by the International Association for Disabled Sailing (IFDS), which closely co-operates with the International Sailing Federation (World Governing Body for Sailing). The sport has grown rapidly and in 2008 has over 70 countries active in Sailing for persons with a disability at a development and national competition level.