Critical thinking "quiz"

Hey all. I need some input, if possible.

Part #1 of the problem: The primary physician/owner of the facility is wanting to have ongoing, random, critical thinking, "pop quizzes" done with the nursing staff. He wants to use this as a tool to continue the critical thinking process. While I think this is a good idea at its base and would like to implement something to that effect, I don't want it to come across as a "we are testing you to see if you are good enough" or as a punitive activity. I want it to be a true learning experience.

Part #2: I am having to basically show proof to the physician/owners of what I have done since I have taken the position in April. I want to incorporate these random "quizzes" but don't want to word it as such. Can anyone help me with how to word this? I don't want these to be a "You answered poorly, so you are a bad nurse" situations, and I don't want the physicians feeling like that is what is occuring.