In a recent internal observation, it was commented that at one point the students couldn't hear me because of the noise level in the next room. However, the observer wasn't going to penalise me for it, because apart from asking the teacher to keep the noise down, there was nothing I could have done about it. However, a colleague told me that if this had been an inspection lesson, I would have been downgraded for this. Is this true? If so, how can I deal with this type of situation, in terms getting the context that I teach in taken into account (I teach in a modern building where rooms are separated by glass penels rather than walls and a door-I don't think the managers will do anything aout this anytime soon because of the cost involved)?