Lateral Thinking

lateral thinking applies to human problem solving. EDWARD DE BONO invented this term "Lateral Thinking" in 1967. It was first written up in a book called "The Use of Lateral Thinking" (Jonathan Cape, London) - "New Think" (Basic Books, New York) - the two titles refer to the same book. The following classic anecdote is provided by DeBono.

A merchant who owes money to a money lender agrees to settle the debt based upon the choice of two stones (one black, one white) from a money bag. If his daughter chooses the white stone, the debt is canceled; if she picks the black stone, the moneylender gets the merchant's daughter. However, the moneylender "fixes" the outcome by putting two black stones in the bag. The daughter sees this and when she picks a stone out of the bag, immediately drops it onto the path full of other stones. She then points out that the stone she picked must have been the opposite color of the one remaining in the bag. Unwilling to be unveiled as dishonest, the moneylender must agree and cancel the debt. The daughter has solved an intractable problem through the use of lateral thinking.