Venn Diagram
History of Venn Diagram John Venn first described these diagrams in his 1880 paper “On the Diagrammatic and Mechanical Representation of Propositions and Reasonings.” Roots trace back 600 years to Ramon Llull (1200s) and Gottfried Wilhelm von Leibniz (late 1600s), with similarities to Leonhard Euler’s 18th-century diagrams. Venn diagram showing the uppercase glyphs shared by […]
Sankey Diagram
Sankey diagrams are a type of flow diagram which is used to represent energy inputs, useful output, material flows, cost breakdowns and wasted output, etc. The entities being connected are called nodes and the connections are called links in which the width of the arrows/links is proportional to the flow rate and are used to […]
Network Diagram
History of Network Diagram Node–link diagrams trace back to the 13th century work of Ramon Llull, who drew diagrams of this type in order to analyze all pairwise combinations among sets of metaphysical concepts. However, the basic idea of graphs was first introduced in the 18th century by the Swiss mathematician Leonhard Euler, whose attempts […]
Geographic Network Diagram
History of Geographic Network Diagram Spatial networks emerged in 1970s quantitative geography, building on mathematical graph theory from physics and sociology. Early studies analysed location, activities, flows, and evolving transportation networks, though limited by data and computing power. Today, geographic networks integrate statistics, probabilities, and real-world stochastic processes. Map showing the Geographic Networks of Global […]
Gantt Chart
History of Gantt Chart The first Gantt chart precursor, known as the harmonogram, was devised in the mid-1890s by Polish engineer Karol Adamiecki. Around 1910, American engineer Henry Gantt created his version, which gained widespread popularity in Western countries. Early Gantt charts were handmade, requiring complete redraws for schedule changes until computers automated adjustments by […]
Chord Diagram
History of Chord Diagram The term chord diagram derives from geometry, where a chord is a line segment connecting two points on a circle. Chord diagrams gained prominence in 2007 through The New York Times infographic “Close-Ups of the Genome,” showcasing genomic relationships. Also known as radial network diagrams, they represent a specialized circular chord […]