The breakdown of communication is implicated in greater than 65% of medical errors and adverse events in hospitals. Social network analysis (SNA) is an effective tool for assessing communication patterns. We applied SNA techniques to the emergency department (ED) setting and measured communication between key ED personnel. Our preliminary analysis identified patterns of cohesion and concentration of communication between ED personnel. The next step in our analysis is to examine the relationship between communication patterns and select measures of quality and performance. Findings will be integral to the development of team training programs that address communication in the ED.