Graph literacy
The skill of reading and reasoning with data displayed visually.
What it means
Graph literacy is the ability to understand and extract meaning from information presented in graphical formats such as bar charts, line graphs, and icon arrays. It is partly distinct from numeracy: a person can be comfortable with numbers yet misread a graph, or grasp a well-designed visual despite weak arithmetic skills. Higher graph literacy improves comprehension and recall of quantitative risk and is associated with making better-informed choices, while poorly designed or misleading graphics can distort judgment regardless of skill. Researchers measure it with brief objective tests and use it to tailor risk communication. It matters because visual displays are increasingly the medium through which medical, financial, and policy risks are conveyed, and their effectiveness depends on the audience's ability to decode them.
Examples
Shown an icon array of 100 figures with 3 highlighted, a graph-literate patient instantly sees the risk is small; another fixates on the highlighted few and overestimates it.
A case chart drawn on a logarithmic scale looks reassuringly flat to most readers. The graph-literate notice each gridline is ten times the last, and see a rise that is anything but flat.
Two colleagues open the same sales dashboard. One reads the trend line and its slope; the other reads only the final bar and announces a collapse the chart never showed.
First described in Galesic & Garcia-Retamero (2011).