How to understand NOC description?

[jes_ON]

So basically you are saying that one shouldn't list ALL his duties/functions, but only main/major? I thought that as much as possible..

Well, you have to (a) describe it in a way that your employer is going to support (after all, they are the ones who are supposed to be writing the letter), and (b) have your most substantial duties "fit" fairly well with the NOC.

You need to make it clear that you are training external clients/students, with a lead statement describing the company you work for and their line of business...