Our primary tool for measuring teamwork in resuscitation includes 3 main categories and 44 items (after performing formal and content validity and deleting 10 items). Items have a 5-point Likert range (from strongly agree to strongly disagree). 12 evaluators rated 5 carefully selected videos from 5 resuscitations in the simulated environment. The questions are:

1- Is the item reduction still necessary after removing the inappropriate items in the face and content validity?

2- What is your suggested method for item reduction in situations where factor analysis was not possible?

Thank you for your attention and response

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