I saw this idea on Pinterest. I tried to search for the original source but I couldn't find it! I have been able to complete my beginning of the year assessments in record time with minimal interruption (there are those few kiddos who will try to force their point across...no matter what :)
When the light is on...no interrupting (reading groups or testing are usually happening)! When the light is off...feel free to ask questions!
I just wanted to share since it has been super effective for me! Apple on!