To me the use of the word "heading" is self explanatory. It means the numbers that follow it are, rather surprisingly, referring to a heading.
I have found that during my 25 plus years as a controller, safety has turned into an industry that now employs hundreds of consultants, experts and managers. In a similar way that can be seen with human factors issues, these people justify their existence by all kinds of initiatives of the 'teach your grand mother to suck eggs' variety.