GOMS and You

1
GOMS and You

• CS125a - HCI
• Alex Feinman

2
Overview

• Background of GOMS
• Application of GOMS
• A Few Examples
• Related Work

3
Background of GOMS

• GOMS was first proposed in Card, Moran, and
  Newell (1983)
• GOMS

4
When to use GOMS

• product design
• evaluating new features/etc.

5
Definitions

• Goals - What the user is trying to accomplish
• Operators - A (simple) action performed in
  service of a goal
• Methods - Sequences of operators and subgoals
  that accomplish a goal
• Selection Rules - Decision points when more than
  one method is applicable

6
Definitions, part 2

• So whats the difference between methods and
  operators?
• Just a matter of where you wish to stop looking
  at detail, e.g.
• Make text bold
• Click icon
• Press mouse button
• Mash button with finger
• Move finger slightly

7
Varieties of GOMS

• Keystroke-level Model (KLM)
• CMN-GOMS
• NGOMSL

8
Sample Analysis