If you have a copy of the syllabus handy, it works like so
2.8.4.2
the 1st number (2 in this case) is for which "block" the syllabus point is part of. Block 1 is up to GFPT, Block 2 is PPL/CPL
The 2nd number (8) is the topic in that block. So you would open up the syllabus to Block 2, then find the topic number 8 (looks to be performance)
3rd number is the heading number, and 4th number is the actual syllabus point. Some points are further subdivided into letters ( a) b) c) etc), like your TEM example. Because Human Factors was a late addition to the syllabus, it is all in the one section right at the back of the syllabus (number 11).
Hope that helps
