It is wonderful to chat with Rebo because it start with introduction first before going conservation and discussion. I prefer about chatting Rebo is it gives feedbacks how my discussion be effective and keep asking followed-questions to build strong discussion. I see as a useful tool for learning because I can reflect the lessons what I have learned. It is very effective for students or teachers. However, It doesn't provide how the discussion effect teaching and how can improve the students by reviewing the answer. Anyway, It is still useful because when I ask it back, it discusses how my activity can useful students. It's great.