Hey Vern – I know of a number of CPA-passers who have passed the CIA – they all said it was pretty easy. Unless they've changed it, the CIA accepts 24 months of public or private experience, can be a mix; there's 4 exams parts, and you can be excused from the last part if you already have a CPA.
It's pretty much all qualitative – haven't seen much in the way of numbers. A lot of questions about hierarchy, who can change policy, who to notify about this/that, how to plan and assess risk, what is the COSO framework and corresponding 5 concepts, etc.
What I'm not too sure about is the CPE required or accepted for CIAs. It doesn't seem like CIA-related CPEs are accepted for CPA CPEs, don't know if it's okay the other way around.
I really can't pass again!