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To develop a comprehensive competency assessment tool for pediatric bag-mask ventilation (pBMV) and demonstrate multidimensional validity evidence for this tool. A novel pBMV assessment tool was developed consisting of 3 components a 22-item-based checklist (trichotomized response), global rating scale (GRS, 5-point), and entrustment assessment (4-point). Participants' performance in a realistic simulation scenario was video-recorded and assessed by blinded raters. Multidimensional validity evidence for procedural assessment, including