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Over the past decades, major changes have been made in basic life support (BLS) guidelines and manikin technology. The aim of this study was to develop a BLS evaluation tool based on international expert consensus and contemporary validation to enable more valid comparison of research on BLS educational interventions. A modern method for collecting validation evidence based on Messick's framework was used. The framework consists of five domains of evidence content, response process, internal structure, relations with other variables, and consequences. The r