Many years ago when I was getting my red cross first aid certification, I learned that when starting any kind of emergency first aid where additional help is needed, you pick someone out of the crowd, point at them, and say, "YOU! GO CALL 911!". The theory goes that by singling someone out, it is more likely to happen. If instead, you just yelled, "SOMEONE GO CALL 911!", the crowd would continue to gather and watch.
I am reminded of this constantly when working with teams who coordinate most of their interaction in email.
Today we had a question about some important batch processing that was supposed to complete last night. Someone wondered if the processing completed as expected and sent an email to three people. The most senior person was out of the office but saw the email and thought, "One of those other two guys will get it". the mid-level person was off on another project for the week, saw the email and thought "I'm out of the loop - one of those other guys will get it". And the third-level person saw the email and thought "With those two other guys on the list, It's not really my place to respond", and the person needing an answer just got radio silence.
A simple change would have made this go a lot differently - hold one person responsible and ask them. At the very least, send the message 'to:' one and cc: the others.
This is not an uncommon occurrence - I think of this analogy all of the time; today I decided to write about it.