This research demonstrates the effects of learner's homophily and diversity in groups on active speech in PBL (problem-based learning), which is one of the concepts in active learning. The date is questionnaires of the supply chain management game for business people. The multivariate analysis reveals that a higher homogeneity of the field in which the learner is interested and greater diversity of work experience, lead to an increase in the learner's active speech. The theoretical and practical implications of this study are in suggestions for team formation among businesspeople, for the promotion of active speech in learners based on organizational learning theory.