Standardised evaluation questionnaire
We used a short standardised evaluation questionnaire to evaluate team members’ experiences with perioperative briefing and debriefing. All members of the eight surgical teams received this questionnaire together with the TCI. Questions were presented as statements and covered the topics ‘cooperation within the surgical team’ and ‘work efficiency’. We used a 5-point Likert scale ranging from 1 (‘disagree strongly’) to 5 (‘agree strongly’) with the statements. Participants were also given the opportunity to report the perceived strengths and limitations of briefing and debriefing.16