Perhaps some explanation of the well intentioned TLA heavy prose. AT is adventure training. MET is meteorology. ACT is aerodrome control trainer which teaches you how to do the bit upstairs looking out over the airfield and controlling take-off, landing and the visual circuit. The rest is radar, teaching you how to do the Zone/LARS, Director, Approach and talkdown disciplines. Zone/LARS is talking to everything that's flying near you, but not going to or from you, Director is talking to everything that's coming to you IFR (ie they can't see out of the window or they're pretending they can't), Approach is talking to everything that's left you or is coming to you VFR (they can see out of the window) and talkdown is getting them onto the end of the runway when they can't see out of the window. Assessed is where they examine you in all the control positions to make sure that you've learnt everything that you've been taught and VISSIM is the part of that which replicates the aerodrome control again. Shimples, yes?