Charts & Visualization

• Bar ChartComparing amounts across categories with lengths a reader can rank instantly.
• Choosing a ChartMatching the comparison you want to make to a chart form that shows it.
• Data VisualizationTurning numbers into marks a person can read in a few seconds.
• Gauge ChartA dial showing one value against a target — familiar, and often the wrong choice.
• HistogramShowing how values are spread by binning them and plotting the counts.
• Line ChartShowing how a measure moves over an ordered scale, usually time.
• Scatter PlotPlotting two measures together to see whether they move in step.
• SparklineA tiny line that shows a shape over time inside a table cell or a headline.
• Stacked Bar ChartTotals plus their composition in one bar, and the readability cost of the choice.
• Table DesignLaying out rows and columns so the important number is found before everything else.

• Accessible VisualizationCharts that survive color blindness, small screens, greyscale printing and screen readers.
• Box PlotSummarising a whole distribution with a median box, whiskers and the outliers left outside.
• Chart AnnotationMarking the thing that happened, so a reader is told what the shape means.
• Chart JunkDecoration that adds ink but not information, and quietly slows reading down.
• Color ScalesSequential, diverging and categorical palettes, and the misuse that invents patterns.
• Drill-DownClicking a summary number to see the detail behind it, and the trap of drilling without a question.
• HeatmapColouring a grid of values so patterns across two categories appear at once.
• Pareto ChartBars in descending order with a cumulative line, showing where the few big causes are.
• TreemapNested rectangles sized by value, for showing parts of a whole when there are many parts.
• Truncated AxesStarting a bar chart's value axis above zero, which exaggerates every difference.
• Waterfall ChartStepping from a start value to an end value through the rises and falls in between.

• Dual-Axis ChartsTwo scales on one plot, where the crossing points depend on the scales you chose.
• Small MultiplesThe same chart repeated on a common scale, side by side, instead of one crowded plot.

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