Can't really add much to what
GHB said but, if there are written procedures (as there should be, of course), the QA auditor's standard comment is... "show me". That is... show me how this particular procedure works, or show me how the person who performs this procedure is qualified/accountable/trained.
You're looking to see that there are procedures for every aspect of Flight Ops. I've found that it often pays dividends to check from people and tasks to procedures. In this way, you find out if any procedures have been omitted from the OM, or are not being followed.
Your action in those cases is, of course, to act to ensure that any omitted procedure is included in the OM. Or, if a procedure is not being followed, you need to work out whether or not the actual procedure in use is better or worse than the written procedure.
Can't tell if you're with a large operator, medium size or small because, from everything I've seen and heard, it seems to be incredibly difficult for a Flight Ops Dept to gain ISO900-2000 accreditation, let alone maintain it. However, I've found that the "show me" approach works well across all Flt Ops Depts and, indeed, many other aviation-related activities as well.
I think you'll find the CASA site to have some excellent information tho. To save you looking it up, it's
CASA. Hope this helps.