The emergency medical dispatcher (EMD) is the principal link between the public caller requesting emergency assistance and the emergency service resource delivery system. As such, the EMD plays a fundamental role in the ability of the EMS system to respond to a perceived medical emergency. With proper training, program administration, supervision, and medical direction, the EMD accurately queries a caller, selects an appropriate method of response, provides pertinent information to responders and gives appropriate aid and direction for patients through the caller