Human Factors Investigation Tool (HFIT)

HFIT is based on a model of how accidents are caused which is in turn is derived from a wide range of different models derived from research. The model is shown in fig below.


The model suggests that accidents occur when a person makes an 'action error', for example, omits to carry out a critical task. Action errors occur because of some fault in the person's information processing sequence, lack of attention, failure to detect information, failure of memory etc. There can be opportunities to recover situation awareness or the action error itself by detecting and correcting the problem. If this is successful, the outcome is a near miss rather than an accident. Problems with situation awareness arise because of threats such as poor procedures, competence, communication, supervision, safety culture or other factors.

HFIT analysis is based on following four-step process :-

  1. Identify action errors.
  2. Identify possible recovery mechanisms from those errors.
  3. Identify the elements of the information processing sequence that failed.
  4. Identify threats that contributed to the incident at any stage in its evolution.


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