Aim: To develop a valid, reliable and feasible teamwork assessment measure for emergency resuscitation team performance.

Background: Generic and profession specific team performance assessment measures are available (e.g. anaesthetics) but there are no specific measures for the assessment of emergency resuscitation team performance.

Methods: (1) An extensive review of the literature for teamwork instruments, and (2) development of a draft instrument with an expert clinical team. (3) Review by an international team of seven independent experts for face and content validity. (4) Instrument testing on 56 video-recorded hospital and simulated resuscitation events for construct, consistency, concurrent validity and reliability and (5) a final set of ratings for feasibility on fifteen simulated ‘real time’ events.

Results: Following expert review, selected items were found to have a high total content validity index of 0.96. A single ‘teamwork’ construct was identified with an internal consistency of 0.89. Correlation between the total item score and global rating (rho 0.95; p < 0.01) indicated concurrent validity. Interrater (k 0.55) and retest reliability (k 0.53) were ‘fair’, with positive feasibility ratings following ‘real time’ testing. The final 12 item (11 specific and 1 global rating) are rated using a five-point scale and cover three categories leadership, teamwork and task management.

Conclusion: In this primary study TEAM was found to be a valid and reliable instrument and should be a useful addition to clinicians’ tool set for the measurement of teamwork during medical emergencies. Further evaluation of the instrument is warranted to fully determine its psychometric properties.