Foundations of Interaction Design
http://www.boxesandarrows.com/view/foundations-of

Malouf, David Heller
Boxes and Arrows
2007

Abstract:

Interaction Design is distinct from the other design disciplines. It's not Information Architecture, Industrial Design or even User Experience Design. It also isn't user interface design. Interaction design is not about form or even structure, but is more ephemeral--about why and when rather than about what and how.