Activating every group member's participation in project-based learning (PjBL) is one of the challenges in the implementation of PjBL approach. This study aims to analyze group member's impromptu participation in a group project. Each group was given a project to create a 5 up to 15-min video blog (vlog) in Business English and Communication class. Content analysis was conducted to analyze students' vlogs that documented their group meetings before the project and the project presentation. The findings reveal that the group member's impromptu participation was situated with the control of members' eye contact, natural visual attitudes, and authenticity of students' vlogs. Moreover, most group members participate actively and spontaneously without relying on notes and scripts in their vlog projects.
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