six thinking hats
CRITICAL THINKING 'HATS' | overview on 9 basic intellectual thinking standards: clarity, accuracy, precision, relevance, depth, breadth, logic, fairness and significance. | by Richard Paul & Linda Elder: ‘Critical Thinking: Tools for Taking Charge of Your Learning and Your Life‘
De Bono's Thinking Hats: a system designed by Edward de Bono which describes a tool for group discussion and individual thinking involving six colored hats. "Six Thinking Hats" and the associated idea parallel thinking provide a means for groups to plan thinking processes in a detailed and cohesive way, and in doing so to think together more effectively.