Transactive Memory Systems (TMS) is one of the theoretical constructs used to account for how team members in high stress, high pressure emergency department (ED) distribute their cognitive and work load for more effective team performance. This study investigated the nature of TMS in ED teams by observing resuscitation team simulations and analyzing behaviours and communications reflecting this construct. The credibility of team members was pre-established based on the team members’ titles. There was an overwhelming propagation and distribution of unsolicited information between
members which indicated the efficiency of TMS in these educational settings. However, it also raised some concerns. This study has implications for training and the design of programs, tools, and electronic interfaces to help improve the efficiency of TMS and ultimately ensure the care and safety of patients.