The Capstone Design class, operated in the Project Based Learning format, is a class in which three groups of learners produce assignments such as beginner-level Vietnamese conversation textbook manuscripts, lecture notes, and lecture videos by following the process of ‘assignment (first draft) - peer evaluation - reflection of peer evaluation opinions - revised manuscript - reflection journal.’ In this study, we analyzed the presentations of the first and second groups’ drafts, peer evaluations by fellow groups, revised manuscripts that accepted peer opinions, and reflection journals written by all students during the second and third weeks of the 15-week class. In particular, when comparing the draft and the revised task reflecting peer evaluation, it can be seen that learners themselves recognize the importance of communication and collaboration capabilities that accept peer evaluation opinions along with enhancing the completeness of the task. In addition, through the analysis data of two consecutive weeks, it was recognized that not only the ability to accept peer-reviewed opinions but also to present peer-reviewed opinions is communication and collaboration capabilities, and a respectful and honest attitude is necessary for this.