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This guide defines Issue Trees (also known as Logic or Hypothesis Trees) as a fundamental problem-solving tool used by top consulting firms like McKinsey. They function as a rigorous "map" of a problem, enabling users to break down complex issues into manageable, MECE (Mutually Exclusive, Collectively Exhaustive) components for analysis and delegation. Issue Trees facilitate effective prioritization, both by structuring data and by allowing logical reasoning in its absence. They can be applied to diagnose problems ("Why Trees") or to systematically generate solutions ("How Trees").
