2 × 2 matrix: Box bisected horizontally and vertically to create four quadrants. Often used to illustrate a typology based on two variables, such as the Four Types chart presented in this book. (Also called a matrix.)

+ Easy-to-use organizing principle for categorizing elements and creating “zones”

Plotting items within quadrants at different spatial intervals suggests a statistical relationship that likely doesn’t exist


Alluvial diagram: Nodes and streams show how values move from one point to another. Often used to show changes over ...

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