Final answer:
In Dr. De Bono's Six Thinking Hats, the person serving as the control function wears the blue hat, organizing and focusing the group's thinking.
Step-by-step explanation:
In Dr. De Bono's Six Thinking Hats, the person serving as the control function is the one who wears the blue hat. The blue hat is associated with the role of managing the thinking processes. The blue hat serves as a moderator or conductor of the discussion, ensuring that the rules of the Six Hats method are followed and that the group's thinking is focused and organized. It is the role that oversees the use of the other hats and shapes the overall thinking strategy.