AATCC M3-2008, High Efficiency Washers in North America, is a monograph on the high efficiency washing machines that replaced conventional top-loading models in the North American market. It describes how these machines differ in water and energy use, wash action and cycle design, and what those differences mean for the laundering procedures written into AATCC test methods and for the appearance and dimensional stability of fabrics. It is background reading for laboratory staff, appliance specialists and textile technologists interpreting laundering results.