Do you allow chatting in your classroom? I am a new sub and don't know how to handle this issue. I honestly don't mind students talking a bit. But I've found in many classes I've subbed for, the students couldn't be productive AND chat. I also find the noise level escalates very quickly, and I get frustrated because I can't find an instigator to centre out. I get the kids to quiet down, but then the noise level goes up again. I get them to quiet down, it goes up again, etc. (I've also noticed it takes more and more effort to get them to be quiet as the day/period goes on). I know there are strategies to handle this. I don't know if I should just have COMPLETE SILENCE or try to have students whisper and intervene if it gets louder?