Cognitive Walkthroughs and heuristic evaluation. Evaluation - definitions. to assess the extent of the system’s functionality (i.e. does it map onto the user’s task requirements) to assess the effect (not affect, generally) of UI on the user to identify any specific problems with the system.
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Polson et al, 1992
Note the order!
1. Apply Q1& 2 to sub-goal B
2. Apply Q1 & 2 to C
3. Apply Q3-7
‘heuristic’ - ‘used of problem solving techniques that proceed by trial and error’ (related to Greek ‘eureka’)
Longman Concise English Dictionary, 1985
a method of usability evaluation where an analyst finds usability problems by checking the user interface against a set of supplied heuristics or principles
Lavery, Cockton and Atkinson, 1996
subjective satisfactionusability metrics
remember materials for next week
time to reach specified level of proficiency, e.g. complete a specified, representative task
note that learning is a continuum
test users on commands after trial session
number of errors in completing specified task
times for experts to complete specified task(s)
frequency of ‘non-productive’ actions
ratio of used to unused commandsusability metrics