The objective for this study is to investigate the impact of knowledge externalization on team performance by the study of knowledge articulation and self-reflection. Multiple regression is applied for analysis of the data collected from 401 participants. The findings designate the significant positive relation between knowledge articulation and team performance. On the other hand, self-reflection is found to have negative relation with team performance. The findings also designate interaction between individual knowledge articulation and self-reflection on team performance. An individual's knowledge articulation is found to be more effective on team performance when the individual has high self-reflection. However, the effectiveness of an individual's knowledge articulation on team performance is prone to be less when that individual has low self-reflection.