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In the world of Six Sigma and Lean problem-solving, teams are often overwhelmed with a flood of ideas, observations, or data points. Organizing these into meaningful patterns is critical to avoid analysis paralysis. One of the most powerful tools for this is the Affinity Diagram , also known as an affinity chart, affinity mapping, K-J Method, or thematic analysis . Initially developed in the 1960s by Japanese anthropologist Jiro Kawakita , the affinity diagram enables teams