In the international business (IB) research field, many have suggested paradigmatic changes to address the complexity of cultural issues. Different paradigms represent different approaches to culture, and in this study, we apply positivist, interpretive, and critical approaches in the context of IB relationships. To address these different approaches within IB instruction, we introduce the theory of interpersonal knowledge. By utilizing this theory and examples of how to analyze business relationships using different approaches to culture, IB teachers can clarify the different approaches and help their students deepen their understanding of the meaning of interpersonal-level analysis in intercultural business settings.