“…Hartson (2003) extended the concept's domain by distinguishing cognitive, physical, sensory, and functional affordances. For example, paper has many different affordances, especially in combination with other technologies (such as pens or thumbtacks), supporting a wide variety of human actions (Sellen and Harper, 2003). Paper documents allow readers to make notes or other marks on them, allow flexible navigation and manipulation, allow users to position or lay out the paper for different purposes, view material in much greater resolution than on-screen, are tangible (involving hands, eyes, and varying position), facilitate the coordination of action among organizational members, provide a medium for information gathering and exchange, support discussion, allow annotation for later discussion, provide a medium for organizing one's thoughts and work processes, and enable storage of information for multiple people, groups, locations, and time periods.…”