You should also make sure they are specific about their communication. when they start dispersing kids In a disaster, inviduals are cargo, and must be tracked as such. How are they going to ensure that when your child is evacuated (and where too???), that you are the one to pick them up? How are they going to know your child is actually out of the building, and not hiding in a bathroom? But perhaps the most important:

Do the children know what to do? Kids aren't stupid.

I believe that an average 5 year old could be given very basic instructions and practice on what to do. In elementary school, we were always in boy-girl-boy-girl alphabetical order by last name. We were expected to line up like this during emergencies, and this allowed the teacher to keep track of us. We then went to our designated spot on the playground/fields. Each teacher was at the head of the class (closer to the building) and an administrator walked around checking to make sure that all teachers had all students. The teachers even had their attendence sheets and would take roll outside. The fire service calls this taking PAR, Personnel Accountability Report, which when pronounced sounds like par in golf.