Bob Cass - You want to have a highly competent control team, not...

You want to have a highly competent control team, not just operationally but technologically, that can set up the exercise and devise the scenarios while keeping the normal group completely in the dark about what's going on. That independence ensures that the emergency team is not over-prepared and ready with all the right answers. You want them to be surprised because that's how it could be during the real event.