The data presented in this article are supplementary data related to the research article entitled “The Copenhagen Tool: A research tool for evaluation of BLS educational interventions” (Jensen et al., 2019). We present the following supplementary materials and data: 1) a standardized scenario used to introduce the test for gathering data on internal structure and additional response process; 2) test sheets used for rating test participant via video recordings; 3) interview-guide for collecting additional response process data; 4) items deemed relevant but not essential for laypersons, first responders and health personnel in the modified Delphi consensus process; 5) inter-rater reliability values for raters using the essential items of the tool to evaluate test participants via video recordings; 6) main themes from coding interviews with raters; 7) comparison of rater results and manikin software output.