“Rightness is what matters in vertical thinking. Richness is what matters in lateral thinking.”

—  Edward de Bono

Source: Lateral Thinking : Creativity Step by Step (1970), p. 29.
Context: Rightness is what matters in vertical thinking. Richness is what matters in lateral thinking. Vertical thinking selects a pathway by excluding other pathways. Lateral thinking does not select but seeks to open up other pathways. With vertical thinking one selects the most promising approach to a problem, the best way of looking at a situation. With lateral thinking one generates as many alternative approaches as one can.

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Edward de Bono 33
Maltese physician 1933

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Edward de Bono photo

“Vertical thinking is selection by exclusion. One works within a frame of reference and throws out what is not relevant. With lateral thinking one realizes that a pattern cannot be restructured from within itself but only as the result of some outside influence.”

Edward de Bono (1933) Maltese physician

Source: Lateral Thinking : Creativity Step by Step (1970), p. 32 as cited in: ACEEE (1994) 1994 ACEEE Summer Study on Energy Efficiency in Buildings. p. 165.
Context: Vertical thinking is selection by exclusion. One works within a frame of reference and throws out what is not relevant. With lateral thinking one realizes that a pattern cannot be restructured from within itself but only as the result of some outside influence. So one welcomes outside influences for their provocative action. The more irrelevant such influences are the more chance there is of altering the established pattern. To look only for things that are relevant means perpetuating the current pattern.

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