It paints a portrait of Interaction Design as a discipline going in two directions: One interpretation is to view Interaction Design as an extension of HCI. The proponents of this view are the old HCI-hardliners like Ben Shneiderman, Don Norman, and Jenny Preece. Another interpretation is to view Interaction Design as a design discipline, with more in common with architecture than with engineering and behavioral sciences.
Interaction Design, by Jonas Lowgren
(thank you mads)