2022-02-16 17:45:02 +00:00
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= Error Handling =
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2022-02-16 18:30:01 +00:00
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Key points
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* humans are the most unpredictable part of any system and therefore the most
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difficult to model for design
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* humans have higher failure rates unde rhigh sctress levels, but are more
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flexible in recovering form emergegeny situations and the last hope in a
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potential disaster
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* there is a tradoff between making the HCI easy and intutive, and ensuring the
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system safety is not comprimised by a cocky operator
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2022-02-16 18:00:01 +00:00
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== Types of human error ==
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2022-02-16 17:45:02 +00:00
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2022-02-16 18:00:01 +00:00
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* slips
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* genuine human error when operating equipment
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* action is not what was intended
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* lapses
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* spacing out
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* mistakes
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* more serious consequences
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* intention is not appropriate
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* Violations
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* purposful breaking things
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== Slips ==
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=== types of slips/errors ===
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* capture errors start of task sequence
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* drive to store, but wound up driving to work
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* description errors two tasks are very similar
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* throwing laundry in toilet
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* data-driven errors counting
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* Meant one number but used another
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* associative activation errors
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* internal associations between tasks, IE fruendian slips
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* loss-of-activation errors
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* forgetting why you started a task
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=== prevent slips ===
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* minimize number of steps by allowing existence of constraints
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* provide clear visible or audible reminders/sugesstions
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* utilize forcing functions
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* IE required step to complete a process
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2022-02-16 18:15:01 +00:00
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* minimize chance of error in the design
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* perform sensibility checks
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* allow for reversal of certain actions
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* feedback or error discovery and corection
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== Error recovery ==
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* attempt to automatically identify the error and provide a solution
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* user will first guess what has happened
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* user will then try to work backwards to find a solution
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* user may not have the knowledge to fix system. user then trys to find a new
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method to do the same thing
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