5Since 1948, the American Alpine Club has documented the year's most teachable climbing accidents, providing invaluable lessons to climbers. In Accidents in North American Climbing, each incident is thoroughly analyzed so climbers can avoid similar mistakes in the future. In our "Know the Ropes," "Essentials," and "Danger Zones" sections, professional guides and other experts offer indepth instruction and copious illustration to help prevent avoidable accidents. This year, Accidents is increasing reports of avalanche incidents of all kinds.