Categories: All - attention - error - human - errors

by Darren Smith 15 years ago

454

Human Error (ACS)

Human error is a prevalent issue often stemming from inappropriate goal selection or insufficiently precise internal descriptions of intended actions. Errors can manifest as slips, such as performing a correct action on the wrong object, or mode errors, where frequently done activities dominate.

Human Error (ACS)

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