Novices - 44 novices (interns and junior residents) with no experience in colonoscopy will be enrolled through a volunteer application form in the study. All novices will be handed written information about colonoscopy in general and basics. Novices will be introduced to the technical characteristics of the colonoscope by an instructor and allowed training for 15 minutes before the data collection is started. No feedback (from instructors) will be given during the training. Instructors will start data collection with introduction of the colonoscope into the anus and the data collection is stopped when the cecum is reached. For training the novices will have a free choice between case 2 and 4. Each novice is given the opportunity to redo the training for as long as they like before they believe to be ready for the final case. Case 3 will be used for the final test and all participants are to complete the case tree times.