Edward deBono invented the The Six Thinking Hats
method in the early 1980's. The method is a framework for
thinking and can incorporate lateral thinking. It is used to
look at issues from a number of important perspectives.
DeBono's six hats are:
White Hat - seeking information
Blue Hat - for planning, monitory and thinking about
thinking
Yellow Hat - looking for the advantages
Black Hat - looking for the disadvantages
Green Hat - being creative, generating alternative
ideas or solutions