Comp. Models of the Mind III b Flashcards
Assumptions at work in process/task models?
- activity consists of tasks performed in pursuit of goals
- hierarchical task descriptions
- plans as conditions for combining tasks
Two ways in which task descriptions in process/task models can be seen as hierarchical:
- Goals are held in a stack (push & pop operations)
- Goals can be broken into subgoals, which can be broken into tasks
Critique of process/task models:
task models are engineering approximations:
- do they actually describe how human cognition works?
- > do they need to? (Marr’s levels)
- do they describe cognitive operations or just actions?
What does GOMS stand for?
Goals, Operators, Methods, Selection rules
GOMS can be described as …
… a framework for task analysis of routine (!) cognitive skills!
What are examples for routine (!) cognitive tasks that can be analysed by GOMS?
Known tasks
Tasks requiring no problem-solving
e.g. Text editing with a familiar text editor
First step in GOMS:
hierarchical task composition
What can be said about the step Goals in GOMS?
define desired states and methods available to achieve them
What can be said about the step Operators in GOMS?
achieve subgoals:
elementary perceptual, motor or cognitive acts
What can be said about the step Methods in GOMS?
achieve goals:
procedures conditional on working memory and world state
What can be said about the step Selection in GOMS?
choice btw competing methods:
conflict resolution
What does KLM stand for?
Keystroke-Level Model
What is KLM an example of?
Of a GOMS model.
What is the result of a KLM?
prediction time = sum of contributions
What does CMN in CMN-GOMS stand for?
Cognitive Perceptual Motor
