Rapport building is central to effective interviewing. However, previous research outlines that rapport is difficult tooperationalize, assess, and train partly due to inconsistent definitions and varying methods of measurement. Asmore international policing organizations embrace humane information gathering approaches, definitions andassessment of rapport must be adapted across cultures and languages to enhance training and professionalpractice. The present study outlines the cross-cultural adaptation of an established tool for measuring rapport inpolice interviews; specifically, the translation of dimensions of rapport-building behaviors from English to Swedish,in combination with adaptation for use within the Swedish culture and legal system. The cultural validation processfollowed the International Test Commission guidelines which involved translation, expert focus groups, interraterreliability tests, and pilot testing with experts. The findings of this process highlighted that aspects of rapportbuilding rely on pragmatic word usage within cultural contexts. For accurate assessment of rapport-buildingbehaviors, compromises on lexical and semantic translations are required when adapting definitions andoperationalizations across languages and cultures. The findings of this study can support researchers and teachersin the assessment and training of rapport-building behaviors, as well as inform future cross-cultural studies ofrapport within investigative interviewing.