This question really throws people. If it is maths or English they sometimes look back at you as if you are mad. They assume it is obvious - a very dangerous assumption - and then completely fail to justify the subject's existence.

"Whatever the subject, I expect to hear things like: to improve skills and independent learning; to encourage team work; to gain a qualification; for enjoyment (very important, rarely mentioned); to enhance other subjects; to develop literacy, numeracy and ICT skills; to improve career prospects; self discipline; memory development; to encourage life-long learning in that subject. The list goes on…