What are FAID Scores?

By March 23, 2016 4 Comments

FAID provides a representative score (FAID Score) of the fatigue exposure of a worker based on the following biological determinants of fatigue:

  • The time of day of work and breaks
  • The duration of work and breaks
  • The work history over the last seven days (this is weighted so that the most recent days provide the most input)
  • The biological limits on recovery of sleep (basically, this acknowledges that you can’t bank up sleep. That is, there is only a certain amount of sleep that can be obtained in a break of certain duration at a certain time of day.)

While the FAID Score is essentially arbitrary, benchmarking studies suggest that fatigue threshold scores of 80 or below are consistent with a safe system of work for Australian industrial operations.

In the absence of a Fatigue Hazard Analysis Risk Assessment Workshop, a Peak Fatigue Threshold score of 80 can be used as a starting point.

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  • Wes Cooper says:

    Thank you for your explanation of how FAID works. I work in an industry that operates 24 / 7 and we have our rosters built around FAID parameters but our threshold is set at 90 % and there is a continuing battle against fatigue.
    I now understand how these biological determinants affect us and how we can now perhaps design better rosters.

    • InterDynamics says:

      Hi Wes

      Thank you for you post on our FAQ section of the website. Please note that the FAID Tolerance Level threshold is a score/value and not a percentage.

      Kind regards,


  • David Mascelle says:

    Good morning.
    I’m a locomotive engineer at Kiwirail, NZ’s national railway operator.
    We run single-manned freight trains and use your FAID tool to assess fatigue.
    Our FAID level is set at 90.
    I note throughout your literature, you recommend a score of 80 or below. Many of your examples are set at 70.
    Could I have your thoughts on our level please.
    Best regards
    David Mascelle

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