Final answer:
As an ethical psychologist, it is important to follow certain guidelines when attempting to collect unpaid bills from clients. Before involving a collection agency, it is recommended to make further attempts to contact the client and resolve the issue directly. If all attempts fail, involving a collection agency can be considered.
Step-by-step explanation:
As an ethical psychologist, it is important to follow certain guidelines when attempting to collect unpaid bills from clients. In this situation, you have already sent Bradley a letter requesting payment, but he has not responded.
Before involving a collection agency, it is recommended to make further attempts to contact Bradley and resolve the issue directly. You could try sending a follow-up letter or making a phone call to see if there was a misunderstanding or if he is experiencing financial difficulties.
If all attempts fail, you may consider involving a collection agency as a last resort. However, it is essential to ensure that the collection agency you choose operates ethically and follows legal requirements.