Edward De Bono - Lateral Thinking

"With lateral thinking one goes on generating as many approaches as one can even after one has found a promising one."
[Lateral Thinking]
At school we're instructed how to think vertically: how to evaluate alternatives, how to pick the right one and how to proceed from premises to conclusions.
However, we rarely get instruction on how to think more broadly, how to create alternatives, and how to generate ideas. That's where this book is helpful.