Children learn more quickly if the brightest are prevented from putting their hands up
Those who are less willing to answer teachers' questions rapidly switch off when a minority dominate, according to Professor Dylan Wiliam, deputy director of the Institute of Education at London University.
He is pioneering an alternative technique in which all children in a class are made to answer questions, by writing their answers on small white boards they are given. They then reveal their answers simultaneously to the teacher.
The article has some reasonable suggestions, but it all brings back the bad feeling I had as a kid. The teacher wouldn't call on me because she knew that I knew the answer. I would pretend not to pay attention in hopes of getting called on. It was so frustrating to know the answer and have to sit through the discussion and not be permitted to speak.