Human Error (ACS)

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Human Error

Endsleys model of situation Awareness

Projection of future system status

Comprehension of situation

Perception of elements in current situation

Post-completion errors

Dont fill up working memory, should be OK

photocopier, ATM machine, filling petrol

Mistakes

correct execution of incorrect action sequence

Arise from the inappropriate choice of a goal

Slips

Most errors are slipsSkilled behaviourLack of attention1 focus of attentionUnconciousEasy to uncover

Mode Error

Watch. Run. Reset

Description

Internal description of intended action not suffiently preciseUsually correct action, wrong object. e.g. OJ in bowl of cereal

Capture

Frequently done activity takes charge

1: Normans 7 Stages of Action

GULFS of execution/evaluation

Goal, Intent, Action Spec, Execution, WORLD, perception, interpret, evaluate.

framework for account for how error may arise from interactingwith technology

Reducing Errors: Screen: Undo, confirmation box, Modes, text boxes,

Reducing Errors: More Knowledge in the world: Visibility, Clues, Affordances, feedback, Mapping, forcing function