Blue Hat: The blue hat is for control. It controls the thinking activities of the thinker, we tell us or others which one of the thinking hats should be worn. Blue hat thinking reminds us when to change the hats. If we are to consider thinking as a formal procedure, the blue hat will control the protocol. By wearing the blue hat, you can make a detailed thinking plan about which order to follow. You can also provide momentary directives by wearing the blue hat.