To ask the Secretary of State for Children, Schools and Families what assessment he has made of the relationship between class size and pupil achievement at (a) Key Stage 1, (b) Key Stage 2 and (c) Key Stage 3.

There is evidence that smaller classes result in an increase in attainment at Key Stage 1, particularly in literacy and maths in the reception year. However the situation is more complex for other age groups. For Key Stage 2 and Key Stage 3 there is no clear evidence that points towards a similar link between smaller classes and pupils' achievement.