What is planning: In ancient times, Sun Tzu said, "Those who win their calculations in the temple before battle shall survive, for they have made many plans; those who lose their calculations in the temple before battle have made few plans. Many plans lead to victory, few plans lead to defeat, and what of no plans at all?" This is akin to the saying, "Proper preparation prevents poor performance." The editorial committee of the Harvard Business Management Series believes that: Planning is a procedure, essentially a rational mental activity. Generally, all planning concerns future events; that is to say, planning involves making current decisions about events that will happen in the future.