09 goms-and-action-analysis - GOMS and Action Analysis...

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GOMS and Action Analysis Brian Bailey
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Announcements User and task analysis due Friday Paper prototype and use scenarios due next week
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Task Performance Task performance is critical in Should measure performance early to
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Real-World Example For every second saved in operator support, a company could save 3M annually [Gray et al., GOMS Meets the Phone Company, Proc. Interact , 1990] New workstations promised to reduce operator support time by 2.5s (or 7.5M in savings) new workstations cost about 1M Compare performance
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Findings Operators slower on new workstations would have cost another $3 million per year GOMS analysis showed that user had to perform more actions along critical path GOMS is a predictive and explanatory model
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GOMS A method to describe tasks and how a user performs those tasks with a design Assumptions
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GOMS Goals : what a user wants to accomplish Operators : actions that change the state of the user or system Methods : groups of goals and operators Selection rules : determine which method to apply, if more than one available
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GOMS Can Be Used To: Predict time to learn tasks Predict likelihood of errors Develop task-centered documentation Predict task completion times
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Apply GOMS When Want a formal method of writing tasks identify intersections across tasks generates discussion via representation
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This note was uploaded on 04/18/2010 for the course CS 465 taught by Professor Karahalios,k during the Fall '08 term at University of Illinois, Urbana Champaign.

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09 goms-and-action-analysis - GOMS and Action Analysis...

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