An event horse must be very responsive to succeed, as a horse that will not listen to a rider on the cross-country phase may end up taking a fall at a jump. The horse should be calm and submissive for the dressage phase, with good training on the flat. For cross-country, the horse must be brave, athletic, and (especially at the higher levels) fast with a good galloping stride and great stamina. The horse does not have to possess perfect jumping form, but should be safe over fences and have good scope. Scope is a broad term used to describe a horse's potential to jump big jumps. The best event horses are careful over jumps, as those who are not tend to have stadium rails knocked down on the last day. The horse also needs to have sound conformation and good feet.