The system used by a business to make certain that its give credit only to customers who are able to pay, and that customers pay on time.
Day 1: Issue invoice and send to customers Day 15: Call customers to check for receipt of invoice Day 31: Call customers and ask for payment Day 45: Send demanding payment letter Day 50: Call customers to chase for debt Day 60: Send 2nd demanding payment letter Day 90: Pass issue to legal department to chase for debt