What do you think is the best way to start a discussion with a subordinate that is not meeting expectations as a collector?

Answer: In my experience, many poor performers do not even realize that they are not meeting the company's expectations. The first thing I would do is document the problem. Then, I would have a private meeting with this collector, present the data I have gathered, remind him or her about the standards established and encourage them to take immediate steps to ensure that [a] their performance improves immediately so that [b] additional disciplinary steps do not need to be taken.