 One potentially promising technique is cap-assisted colonoscopy. A transparent cap or hood is a simple plastic device that can be attached to the tip of a colonoscope before performing the colonoscopy. Several randomized trials from Japan have mixed results regarding improved cecal intubation times and polyp detection rates. A recent large study from Hong Kong showed improved time to cecum but a reduced polyp detection rate. To date there is no large randomized study using the cap in a western population, in whom the colorectal cancer CRC incidence is known to be higher. We plan to conduct a randomized controlled trial to investigate the usefulness of cap-assisted colonoscopy in a Western population. 