The world of credit control brings to mind the infamous Donald Rumsfeld quote:
"There are known knowns; there are things we know that we know. There are known unknowns; that is to say, there are things that we now know we don't know. But there are also unknown unknowns - there are things we do not know we don't know."
Admittedly he was talking about weapons of mass destruction, but the same applies to your customers' financial situations, and effective credit control eliminates as much of the 'unknown' as possible, and maximises the 'known knowns'.
Read more: Counting the financial cost of poor credit control