DHB chief medical officer Dr John Gommans said it was proven internationally that by following the checklist properly, through good team engagement and communication, unintended consequences were reduced.
"The checklist has three stages: sign in, time out before starting surgery and a sign-out debrief - making sure at each stage we are ready to proceed and do the job properly," he said.
Surgery was not hierarchical and each team member had an important role in the DHB's seven theatres, he said.
"It is not the ticking of boxes that is important but the communication and engagement of the team around the process."
Dr Civil said surgery team members changed daily and pre-operative briefings helped build rapport and ensured everyone understood their roles.
"Ensuring that everyone in the room has spoken at least once before the operation begins is important. Research has shown they are more likely to speak up if they have concerns about patient safety.
"The team should also discuss anticipated problems with staffing or equipment, talk about expectations for the day and deal with any questions or concerns. This means everyone knows exactly what is, or should be happening."
There would always be a small risk of unintended consequences "but we can certainly make sure that we do everything we intend to do".