What is a Known Deviation in HFACS?

What is a Known Deviation in HFACS?

• A. Error
• B. Known deviation
• C. Deliberate deviation from known standards, policy or SOP, yet outcome was unintended
• D. Unsafe act

Answer: (C)

Known Deviation is a deliberate departure from established standards, policy, or SOP that the operator knows about, even if the final result wasn’t what was intended. In HFACS, this kind of action is a violation: the person consciously chooses to deviate from rules rather than make an unintentional mistake. The key point is the intentional nature of the deviation, not the outcome. The outcome being unintended doesn't remove the deviation from the classification; it just describes the result. This helps investigators distinguish between unintentional errors and conscious rule-breaking, pointing to where safety culture, pressures, or procedures may be enabling such deviations. Other options don’t fit as well: an error is unintentional, a broad unsafe act is too vague, and simply naming it a deviation without the deliberate, known aspect lacks the specific HFACS nuance.

Known Deviation is a deliberate departure from established standards, policy, or SOP that the operator knows about, even if the final result wasn’t what was intended. In HFACS, this kind of action is a violation: the person consciously chooses to deviate from rules rather than make an unintentional mistake. The key point is the intentional nature of the deviation, not the outcome. The outcome being unintended doesn't remove the deviation from the classification; it just describes the result. This helps investigators distinguish between unintentional errors and conscious rule-breaking, pointing to where safety culture, pressures, or procedures may be enabling such deviations. Other options don’t fit as well: an error is unintentional, a broad unsafe act is too vague, and simply naming it a deviation without the deliberate, known aspect lacks the specific HFACS nuance.