What is the credit rating that is shown on the final notice?

We have an internal credit rating to determine if an account is at risk of being left unpaid. Each time a customer receives a Late Notice, it carries a weight value of 20 points. If left unpaid after this notice, the account will be due for a mailed tag, and an additional 30 points will be assessed. When reviewing credit history, we look at 12 months history to determine the risk factor and if a deposit will be required.