An obvious need for any modern emergency communication system is that, instead of just giving warnings, it must also be able to give clear instructions about what to do because of the emergency. The Rehabilitation Engineering Research Center for Wireless Technologies found that, no matter what type of warning was first sent, another second type of warning was needed before people would trust the warning and do something because of it. A system that is able to give warnings in many different ways may save lives and stop an emergency from being too terrible.