1. DOET Intro
ITEC4130
Dr. Jim Rowan

2. Norman on DOET The three outstanding themes:
It’s not your fault
Design principles
Conceptual models
Feedback
Constraints
Affordances
The power of observation

3. Other terms to be seen in DOET
Design model
(designers’s conceptual model of the world)
System model
(the model of the world presented by the device)
User model
(user’s conceptual model of the world)
Knowledge in the world
Knowledge in the head

4. Impressive design failures
Apollo 13 mission representation failure
A320
Therac 25
from “Set Phasers on Stun” by Steven Casey