Six Thinking Hats

The de Bono Hats system (also known as "Six Hats" or "Six Thinking Hats") is a thinking tool for group discussion and individual thinking. Combined with the idea of parallel thinking which is associated with it, it provides a means for groups to think together more effectively, and a means to plan thinking processes in a detailed and cohesive way. The method is attributed to Dr. Edward de Bono and is the subject of his book, Six Thinking Hats (Source;- Wiki)

Six Hats

Simple Definitions of these color hats.

White Hat:-Call for information known or needed.
Yellow Hat:-Symbolize positiveness, optimism and brightness.
Green Hat:- Focused on new ideas, creativity, the possibilities and the alternatives.
Red Hat:- Related with feelings and intuitions.
Blue Hat:- Symbolize to the thinking process.
Black Hat- Also known as Judgement Hat- its negatively think why process or something is not working.

For more info watch above video.