We developed an evidence-based model illuminating team knowledge exchange processes as a key link between organizational diversity climate and the effectiveness of multicultural teams (MCTs). Our analysis is based on 143 in-depth interviews and extensive observations of team interactions that occurred in 48 teams from 11 companies. Our findings revealed that teams that oscillated between assertive and cooperative knowledge exchange processes were more effective. We also found such dual processes were more prevalent in organizations that had an engagement-focused diversity climate characterized by utilization of diversity to inform and enhance work processes based on the assumption that cultural differences give rise to different knowledge, insights, and alternative views. Based on our findings we developed specific propositions about optimizing MCT knowledge-exchange processes to guide future research and practice.