cloudyapple：
Yes, actually I have been teaching ATC for a couple of years, because the way we provide ATS is quite different from what you do, I just want to make something much more clear, and I am quite interested in what you do in the UK. Of course I have my own answers to the questions I asked, I am just eager to know what you think on the same topic, I would like to make some comparison between the different ways to solve the same problem.
When I read DOC4444, I really have something I can't understand very well, because there 's something we never apply before, for example, we don't have uncontrolled airspaces in china, so I am eager to know everything about uncontrolled airspaces, we don't use mode s to identify the aircraft, so I am quite interested in how you use mode s etc.
I hope you understand that well.