For more than 75 years, the American Alpine Club has documented the year’s most teachable climbing accidents, providing invaluable lessons to climbers. In Accidents in North American Climbing, more than 100 rock climbing, mountaineering, and ski alpinism incidents are thoroughly analyzed to help climbers avoid similar mistakes in the future. In our Know the Ropes and Essentials sections, professional guides, rescuers, and other experts offer in-depth instruction and copious illustration. This year's Know the Ropes stories address rappelling errors and the human factors in climbing accidents.