December 2025
- Dec 22, 2025TechnologyEffective Dashboards: Design for Actionable InsightsA working dashboard starts from three constraints: one primary audience, one decision, and the frequency at which that decision gets made. Everything else, chart choice, metric count, layout, follows from them. George Miller's 1956 paper on the limited span of immediate memory is why the practical ceiling sits at roughly 3 to 7 primary metrics, with the rest pushed into drill-downs. Vanity metrics that only move one direction drive no decisions at all.
- Dec 19, 2025TechnologyBest Practices for Effective Data VisualizationPosition along a common scale won, then length, then angle, then area, with color saturation and volume worst, which is why bar charts beat pie charts and why 3D effects and bubble sizes mislead. Their 1984 paper is the reason these rules exist rather than being matters of taste. The page covers Tufte's data-ink ratio, direct labeling over legends, sequential and diverging color, and how truncated axes and dual axes distort what readers conclude.
August 2025
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