'Hundreds of schools'published at 07:50
BBC Breakfast
Nicky Morgan has spoken to BBC Breakfast about her plans to crack down on what she calls "coasting" schools.
These, she said, are defined as those who are "not helping all pupils to make the progress they should".
Explaining her definition further, she said results would be looked at over three years, 2014, 2015 and 2016. For primary schools, the key thing will be how many pupils are ready for secondary school in terms of reading, writing and matths standards. For secondary schools, GCSE results will be crucial.
She said she couldn't predict how many there would be, "but it will be hundreds of schools", including some "in leafy areas".
For any teachers worried about yet more change in their industry, she added: "Schools will have time...we will work with the profession."