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Human Error Classification

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Slip

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An unintended action; a slip of action often occurs when the person's intention is correct but the execution goes awry. Example: Typing the wrong letter on a keyboard.

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Lapse

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A memory failure; it happens when a routine task is forgotten. Example: Forgetting to save a document before closing it.

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Mistake

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An error resulting from a faulty plan or decision. Examples: Choosing the wrong method to solve a problem, misdiagnosing a medical condition.

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Rule-based mistake

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Mistakes in applying good rules to the wrong situation or bad rules that lead to undesired outcomes. Example: Administering a standard medical procedure that's contraindicated for the patient.

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Knowledge-based mistake

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Errors made when facing a novel situation and the individual lacks the necessary knowledge. Example: An engineer incorrectly assessing an unknown machinery fault.

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Skill-based error

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Occur in highly practiced tasks when attention lapses, usually due to complacency or over-familiarity. Example: A skilled musician hitting a wrong note.

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Perception error

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An error made when sensory input is misperceived or misinterpreted. Example: A pilot misjudging the altitude of the aircraft on a hazy day.

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Procedure violation

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Intentionally not following established procedures or rules. Examples: Skipping steps in safety protocol, ignoring traffic signals.

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Memory lapse

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Forgetting to carry out an action or part of an action. Example: A server forgetting to place a customer's order.

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Attention failure

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Failing to pay attention to the relevant information. Example: Not noticing a stop sign and driving through it.

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Loss of situational awareness

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The failure to correctly understand what is happening in the environment around you. Example: A driver not noticing icy road conditions.

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Interpretation error

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Mistake made when one misinterprets or inaccurately assesses a situation. Example: Misreading a patient's symptoms and suspecting the wrong illness.

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Decision error

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A bad choice or judgment in response to a situation. Examples: Investing in a poor stock based on insufficient research, choosing an unsafe route.

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Communication error

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Failures during the exchange of information. Example: A nurse misinterpreting a doctor’s dosage instructions.

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Violation of protocol

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Deliberate disregard for rules, standards, or procedures. Examples: Unauthorized access to confidential files, deliberately ignoring cleaning protocols in a lab.

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Action bias

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Preference for action over inaction, which may lead to unnecessary or incorrect actions. Example: A football goalie diving in one direction during a penalty kick instead of staying in the center to increase chances of blocking.

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Confirmation bias

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Tendency to seek, interpret, and create information that confirms existing beliefs. Example: A doctor dismissing evidence because it contradicts their diagnosis.

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Overconfidence bias

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When a person's confidence in their judgment or abilities is greater than the accuracy of those judgments. Examples: A trader overestimating their financial forecast abilities, causing significant investment losses.

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Availability heuristic

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Over-relying on information that is readily available or recent when making decisions. Example: Judging the likelihood of a plane crash based on recent news stories rather than statistical data.

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Omission error

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Occurs when a required action is not performed. Example: An air traffic controller failing to issue a crucial command to a pilot.

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