The present study extends Du-Babcock’s (1999, 2006) research stream of the first- and second- language communication by examining the functional role behaviors (i.e., task-facilitating, relational- maintenance, and self-oriented) performed by Hong Kong bilingual Chinese participating in the interconnected L1 and L2 decision-making meetings. The simulation provided the setting for the development of realistic business dialogs. The data consisted of 22 transcripts of decision-making meetings (11 of L1 and 11 of L2 meetings). Using the schema developed by Benne and Sheats (1948) and Barker, Wahlers, Watson, and Kibler (1995), the number and frequency of the role behaviors of each participant were codified, counted, and compared. To examine the effect of language use and second-language proficiency on role behaviors, three research questions are put forth. The study concludes by examining the findings in regard to language explanations of L1 and L2 onto the role behaviors and makes recommendations for future research.