Defining Interaction Design: An Interview with Alan Cooper
According to Alan Cooper: "Look and Feel stuff is Interface Design. It's all very stylistic. It's the color that you paint your walls. Interaction Design is about the Architecture. It's what kind of building are we building. What functions does it support." (2000-02-27)
The link address is: http://www.uidesign.net/2000/interviews/cooper1.html