Dogs and handlers enter obedience trials to demonstrate their ability to complete various tasks amid a high level of distractions. Competitive obedience offers a very stylized manner of skill in performing on lead and off lead control. Dogs are judged on different skills at different levels. Beginning levels evaluate heeling skills, the recall and stationary exercises. Intermediate levels expand to evaluate retrieving and jumping. Advanced levels include off lead heeling and control at a distance without verbal commands, directed retrieving, scent discrimination and directed jumping.