Hi Davide,
sorry for answering a little bit late.
I have to recognise that my question was not very precise. What I meant was testing in the simulator (I have changed the thread accordingly). Therefore I agree with you in the possible testing of plain language in the "debriefing" (at the very end, when the "procedural" part is really over; by the way, I also regard the "briefing" as inapropriate because here it is aimed for mentally preparing for the actual "procedural" part). During the LOFT scenario, in my humble opinion, no mental capacity should be spent for plain language! If not, I fear that one day there will be a major incident/accident where the human factors studies determine focusing on "plain language" during routine cockpit work as one important factor that has led to miscommunication and to the resulting catastrophe. This is what I derive from my studies so far. YET I HOPE I AM WRONG! Thank you for your answer, Davide, maybe my fear is exaggerated. Let's hope so...
Many happy landings,
Franz