In my embedded systems, we sold the hardware along with the software, so we just used pre-configured configuration files. In the Oracle HR/Payroll project I just got off of, it was a bloody nightmare. All sorts of localized rules and rates. France seemed to have some of the strangest rules.

On the current project, I'm hoping it shan't be too much of a headache, as we are dealing with mostly flags, comments and user originated documentation. But as we add more and more features, it's likely to become a bigger and bigger problem (as most projects are wont).

Just asking why you were diving into at this juncture for clarification.