Nowadays for improving quality of teaching English at schools in Vietnam and other emerging countries, we need to enhance more educational supporting tools such as team-based teaching method and case study method. By using methods such as: qualitative explanatory study and also use classroom observation, The findings of the study show that there are some features of team teaching including but not limited to: first, there are experience sharing via experienced teachers and trainers; second, teachers can share relax teaching environment and create motivations for students then they can improve communicative skills; and third, both teachers and students can improve language. Last but not least, team-based teaching also enabled educators and students to share and transfer knowledge and experience to share responsibilities and help each other. Moreover, it revealed that most participant claimed to have benefits from team teaching as a tool to improve their professional development.

English as foreign language, team-based teaching, professional development, schools