Question regarding ISA's

Dear sir, I am in a bit of a pickle! Doing a question on Isas (Air 6/06) in the bpp exam booklet. The question asks about the due process of the IAASB involved in producing an ISA’s, overall authority of ISA’s and how they are applied in individual countries, extent to which auditor follows ISA’s and extent to which is applies to small entities. For 20marks, I’ve looked at my own notes and cannot find any more in depth info to hw bpp have answered the q!! I understand it’s a 2006 paper so will there be a q that’s really in depth like this one? If so where can I find more in depth notes!??LThanks in advance.