Best way for actor selection
This is an engineering environment. We have a group called Engineering that has 5 people:
George, Harry, Sally, Jose, Ming
Anybody in the group can create a part. Create a part is a task. After we create the part it goes to a task called "Check part". According to our rules the person that created the part cannot check their own work.
Task: Create Part
Task: Check Part
As it is now when George completes a part then he still shows up in Check Part for his own part.