ORCA is the acronym of Occupational Risk Calculator and is a method to assess hazards at work. It is a model that calculates occupational risks, similar to the calculation of risks for external safety. It provides insight into relative risks at work and can be used to draw conclusions about absolute risks at work.
Risk assessments are used by companies to identify the risks within their organisation. However, no method was available to quantify and prioritize these risks. ORCA (Occupational Risk Calculator) provides the quantification and prioritization.


ORCA is based on three databases that were developed and constructed, commissioned by the Ministry of Social Affairs and Employment. These databases contain information about:

  1. (underlying) causes of serious accidents that are reported to and investigated by the Labour Inspectorate (also available in a stand alone application called Storybuilder),
  2. exposure to hazards and the quality of working conditions that affect the risk,
  3. cost and effectiveness of measures to reduce risk.

The model predicts probabilities of an accident with serious consequences, which are fatality, permanent injury or recoverable injury with hospitalisation within 24 hours.

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