how to effectively manage group discussion in active learning

Problem:
– Teaching model in Vietnam is teacher driven, students wait for answering the questions from teachers.
– Sometimes the discussion become unbalance and unproductive
Solution:
– students can choose topics by themselves
– the teachers should act as a domain expert who will question in a domain or correct the direction of the discussion
– The teachers ask students do not bring books to meetings; write some notes during the brainstorming session.