The book Six Thinking Hats is indeed a very good one to unveil the skill of thinking methods.

Here below is a brief introduction of fuction of each hats:

White Hat
White is neutral and objective. The white hat is concerned with objective facts and figures.

Red Hat
Red suggests anger (seeing red), rage and emotions. The red hat gives the emotional view.

Black Hat
Black is somber and serious. The black hat is cautious and careful. It points out the weaknesses in an idea.

Yellow Hat
Yellow is sunny and positive. The yellow hat is optimistic and covers hope and positive thinking.

Green Hat
Green is grass, vegetation and abundant, fertile growth. The green hat indicates creativity and new ideas.

Blue Hat
Blue is cool, and it is also the colour of the sky, which is above everything else. The blue hat is concerned with control, the organization of the thinking process and the use of the other hats.

You could find a good summary of this book at:

Keep thinkin’

Jeff Wang
15 February 2009