If you have attended one of my Twilight training sessions, you will know how great I think Dylan William is. He bases everything he advocates on in-depth research. A very short but clear explanation by Dylan William of the basketball questioning technique is here:
William also mentions the importance of ‘no hands up’ in the classroom
Here is a clip from a BBC programme which looked at putting this research in practice (I should be able to get my hands on a copy of two part series that looked at this.):
<edited> – I have found a copy of the series – if anyone wants to watch it.