Calculating risk score

Answer:

In order to calculate likelihood or severity, you need to determine the criteria for them. This means that you need to define the scale and explain how each value is assigned. For example for likelihood you can have the scale from 1 to 5 where one is the least likelihood and 5 is the most. Value 1 will represent the occurrence of the events 1 in ten years and 5 will be for daily occurrence, and of course you need to define all the values in between.

Another very important point regarding hazards in OHSAS 18001 is that you can relay on the hazard evaluation or assessment conducted by some authorized organization. In many countries the companies are obliged by the law to assess work place hazards and you can refer to this assessment if your company has already performed it.

For more information, see: How to identify and classify OH&S hazards https://advisera.com/18001academy/blog/2015/05/14/how-to-identify-and-classify-ohs-hazards/