Busy professionals known as "knowledge warriors" have no time for courses, no need for grades. They learn in new ways, through new technologies. In 2001, Harvard Business School and Stanford University created a working model of a futuristic advanced learning system that enabled them to research the desirability of several visionary concepts with chief learning officers and top HR executives. The model helped everyone to start from an identical vision and underlying assumptions, and to provide meaningful feedback about the future of corporate and professional learning. At the core of the new performance support system is a taxonomy or competency map that organizes changing job requirements and small chunks of content.