Slide: Data Visualization Principles

This skill teaches the four principles that distinguish a consulting-grade data chart from a generic Excel chart. The principles are NOT the usual "pick the right chart type" advice — that's downstream. The upstream question is always: what argument does this chart make?

Charts are evidence, not decoration. Data ≠ Information ≠ Insight. Raw data is non-structured noise. A chart structures data into information. The page title turns information into an insight. Charts must be designed working backward from the insight.

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