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GOMS as a Simulation of Cognition

This article explores GOMS architecture as a simulation of cognitive processes, providing a framework for analyzing tasks and predicting user performance. It discusses the hierarchical structure of tasks, assigning operators to goals, and estimating operator times.

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GOMS as a Simulation of Cognition

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  1. GOMS as a Simulation of Cognition Frank Ritter, Olivier Georgeon 28 oct 2014

  2. Cognitive architectures • "Brain emulator" • Simulates the computation we think the brain does (for doing a given task…). • Provides structures to store symbols • Provides instructions to manipulate symbols • Hypothesis: Goal-driven, Problem-solving, symbolic computation.

  3. GOMS Architecture

  4. Example: Check email • Procedure check_emails • Goal Login • Goal read_email • Goal memorize_sender's_name • Goal read_email_body • If Needed(), Goal replay_email • Goal reply_email(x) • Selection rule Select_appropriate_formulation(x) • Goal reply_email_friend • Operator Type (Hi <x>) • … • Goal reply_email_familly • Operator Type (Dear <x>) • … • Loop to read_email / Repeat Goal read_email • Goal: Logout Note: Needed() will be translated as a mental op, but is usually more complex

  5. Mental operations Visual buffer Long term memory Perceived_item: John (John, relation, friend) (Jack, relation, family) (email, name, John) Goals Selection rule Reply_email_friend Reply_email_family memorize_sender's_name If Perceived_item = X And (X, relation, friend) Then Process goal reply_email_friend

  6. How To Use GOMS • Analyze hierarchical structure of a task • coarse analysis focuses more on the cognitive structure of a task • fine analysis focuses more on the structure imposed by the specific interface design • Analyze alternative methods • Assign operators to base level goals • Assign times to operators • Sum the operator times

  7. Operator Times More available in ABCS, GOMSL and CM&N

  8. Summary • A method to describe tasks and how a user performs those tasks with a specific design • bridges task analysis with a specific interface design • error-free, goal-directed, and rational behavior • Views humans as information processors • small number of cognitive, perceptual, and motor operators characterize user behavior • To apply GOMS: • analyze task to identify user goals (hierarchical) • identify operators to achieve goals • sum operator times to predict performance

  9. KLM To do the KLM, keep track of [derive on blackboard]

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