In "Lateral Thinking" by De Bono, the difference between vertical and lateral thinking is explored. While vertical thinking involves being right all along and exercising judgement at every stage, lateral thinking allows for being wrong on the way to finding a tenable position. The need to be right all the time can inhibit creativity and progress, and delaying judgement can lead to new insights and ideas. The practical application of suspended judgement involves exploring ideas and delaying judgement to extract as much usefulness as possible.