“Interaction design is a broad term inflected in different ways in different communities. To us, interaction design comprises all efforts to understand human engagement with digital technology and all efforts to use that knowledge to design more useful and pleasing artifacts. Within this arena, the main audiences for this book are those who conduct work in the fields of human–computer interaction, computer–supported collaborative work, computer–supported collaborative learning, digital design, cognitive ergonomics, informatics, information systems, and human factors.” (Victor Kaptelinin and Bonnie Nardi – First Monday 12.4)