Sun Tzu's five rules for assessing the value of a campaign by a larger mission.
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This article explains that Sun Tzu saw that campaigns can easily take on a life of their own. Since they cover long spans of time, months and even years, it is easy for us to lose sight of their ultimate purpose. This is especially difficult because campaigns involve more or less constant interaction with our environment. As we interact with our environment, it is easy to get turned around. As the flow of events take us in unanticipated directions, layer on layer of short-term goals can eventually bury the original purpose of the campaign.