The medical director plays a key role in the professional development of paramedics as well. In almost all cases, the medical director will have, at a minimum, input into the curriculum of paramedic training at a local level. In a great many cases, they will also teach some portions of the program, supervise clinical rotations of paramedics, and in some cases, precept their initial field practice, prior to formal certification or licensing. In almost all cases, the medical director will be charged with the creation of all protocols and standing orders, and with any research that goes into their creation. The medical director will also, assisted by others, be responsible for the creation and development of the Standards of Practice for their EMS system. Throughout the paramedic's career, the medical director will provide the mechanism for medical quality control, conducting chart audits and reviewing medically related service complaints, and may often have the ability to de-certify individual paramedics for cause. Medical directors will also act as advocates for their paramedics, advising elected officials and building support within the medical community for expanded scopes of practice when appropriate. Finally, medical directors will act as expert advisors to those in the EMS system administration and government administration, with respect to policies and legislation required by the EMS system, and in guiding its future direction. In this model, the paramedic is very much seen as an 'extender' of the emergency physician's reach. It is rare to see physicians in the field, unless they are precepting new paramedics or performing quality assurance activities, or are residents in emergency medicine training programs, gaining required field experience or conducting research. Medical directors and ED physicians will occasionally go into the field for large incidents, such as multi victim accidents and disasters to assume on site medical command.