"A picture is worth a thousand words!"
When you say an oration in a new language, it's very difficult to remember exactly what you said, let alone if your oration had mistakes or not in it.
At OCTB, the instructors transcribe everything the learner says during the class exactly the way he/she said it. The teacher then make the corrections, and the learner can visualize all of this in real time. This not only gives him confidence, seeing that he was understood despite some mistakes, but also points out exactly what he/she should work on in future classes.