UXD 210

Spring 2020

Craig Miller

Weekly Notes

Assignments

UCD Theory

This page summarizes major concepts from Norman's chapters 2 and 3. Plus a few bonus concepts.

Action Cycle

These stages of interaction operate from a high-level goal.

  1. Goal
  2. Plan
  3. Specify
  4. Perform (physical action sequence)
  5. Perceive
  6. Interpret
  7. Compare

Two Systems (modes) of Cognition

Adapted from Kahneman's Thinking, Fast and Slow

  • Fast / unconscious
  • Slow / deliberate

Questions:

  1. Which mode is associated mostly with novices? With experts or practiced users?
  2. Which mode better supports multi-tasking?
  3. Which mode is adversely affected by an unusual circumstance?
  4. Which mode is most dependent on perceived feedback?
  5. Which mode engages Norman's phases of interaction?
  6. Contrast to Norman's three levels: Reflective, Behavioral, Visceral. Are we really talking about 3 modes?

Two Systems of Memory

  • Short-term memory
  • Long-term memory

How do these two systems map on to the modes of thinking?

Consider this approximate model from Norman in ch. 3:

There are five memory slots in short-term memory. Each time a new item is added, it occupies a slot, knocking out whatever was there beforehand.

Two knowledge sources

from Norman ch. 3

  • Knowledge in the head
  • Knowledge from the world

Perceptual Principles