1) There is significant inter-observer variability in Glasgow Coma Scale (GCS) scoring among doctors and nurses assessing patients with head injuries in the emergency room. 2) A study of 100 patients found discrepancies in 42% of GCS scores recorded, with differences of up to 3 points between observers. 3) The variability in GCS scoring means that protocols for managing head injuries based solely on GCS may misclassify patients, necessitating the development of GCS-independent protocols.