Novice
You've mastered the basic aids in walk, trot and canter. You're confident on a well-schooled horse in walk, rising trot (posting), and for short periods of canter in a school or even outside.
Intermediate
You're a secure and confident rider on a well-schooled horse at all paces including a fast canter in open country. You're happy to ride for several hours and may have some jumping experience.
Advanced
You're an experienced rider, confident and relaxed on horseback. You ride regularly, have an independent seat and soft hands. You're capable of handling a spirited horse in open country and are happy to jump. You have experience of riding a variety of horses.