The ‘importance’ value is how important the required level of knowledge, skill, or ability is to an occupation. This ‘importance’ value is referenced as a numerical value and is graded out of 100.
By comparing level and importance across all occupations, we can view similar occupations based on overlap between the two. If we take a registered nurse’s knowledge of medicine and dentistry as an example, they would require “65 out of 100” in terms of their level of knowledge, but the importance of having that knowledge is scored “91 out of 100″. They don’t need to know everything about the topic, but what they do need to know is very important to their job.