This paper investigates whether a secondary teacher trainee improved pair/group work management skills in a short-term teacher training program focusing on the development of TEE-related skills. One female teacher trainee, students, and a teacher trainer participated in the study. The participant’s teaching performance, conference on her teaching performance, lesson plans, and the teacher trainer’s feedback on the teaching performances were collected. The data on teaching performance and conferencing were transcribed and analyzed in terms of a moving-in phase, a monitoring phase, and a moving-out phase. The participant showed improvement in changing seating arrangement, selecting students in modeling, increasing various kinds of comprehension check up questions, changing her voice during monitoring, and drawing students’ attention and signaling a new phase of lesson to the students in a moving-out of the activity. This study suggests how to improve management skills in pair/group work in TEE classes.