Margaret Rudland, president of the Girls' Schools Association, said member schools already had a moral dimension to their work. "Perish the thought that moral instruction will be included in every A-level course."
Last week Nick Tate, chief executive of the School Curriculum and Assessment Authority, said that every A-level should have a moral dimension. Ms Rudland, head of The Godolphin and Latymer School, west London, said: "Honesty and integrity are more likely to be learned through the systematic study of an objective discipline, such as mathematics, than by threatening its intrinsic integrity with a superficial overlay of morality."
The association, which represents some 230 schools teaching 110,000 girls, agreed to pilot an entry baseline assessment test.