Sun Tzu's six rules regarding the effect of progress on creating new situations in campaigns.
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This article explains how Sun Tzu's Warrior's Rules teach us that situations evolve in predictable ways over time. This is especially true of the progress in a campaign. People often expect campaigns to continue as they begin, but they never do. Situations do not just repeat themselves. They evolve over time. This means what works at the beginning of a campaign will stop working. Different situations require for different responses. New situations arise as we get more deeply committed to an opportunity.