Credit Policy for businesses and how to extend credit and manage credit risk

On May 15, I posted a topic called "What makes a Good Collector?"  I had some good feedback on that post and wanted to elaborate on those items.  The first item is:

Identify the most common forms of credit activity

I would love some feedback from you on what constitutes a common form of credit activity in your opinion.  I am going to list some of mine here, please leave comments with yours and see what we all come up with!

Paying bills late or on time

Applying for credit

Changing jobs or losing a job