How do you determine overall mission risk?

You could determine overall mission risk by: Using the highest residual risk of all the identified hazards.
Residual risk refers to the action that still contain some sort of danger even though we already conducted any form of safety measurement for that action.
By knowing the highest residual risk, we could determine the STANDARD SAFETY MEASUREMENT TO TAKE to prepare for the worst possible scenario.

Hi can we get the new stuff from the shop for a couple days so that you will be in a hot room for the winter