The following by headteacherguru explains why think pair share is so effective.
This excellent article makes a compelling case for ‘think pair share’ to become an essential part of your classroom routine. It covers elements of good questioning as well as returning to Dylan William’s compelling argument that ‘no hands’ is the most effective strategy in a classroom.
If you want to watch the whole two hours of William’s ‘Classroom Experiment’, then here it is:
Learning and Teaching at Abbot Beyne 
Left a crucial piece of marking on my table so watched this instead. Great programme & cliff hanger at the end means I am going to watch episode 2 after ‘The Village’. Hope it’s worth it!
Marie