 Teaching colonoscopy is difficult and time consuming. Most experienced colonoscopists are unable to give detailed guidance without actually taking over the procedure from the trainee as their perform-ance of colonoscopy has become largely automated or unconsciously competent over the years. It follows that a necessary foundation for effective and high quality training is a faculty of trainers experienced colonoscopists who have themselves received training as trainers, are aware of the quality of their own performance, and agree on the criteria for a high quality colonoscopy. 