This scatter plot visualization explores the Iris flower dataset by displaying four coordinated plots in a 2x2 grid. Each plot shows sepal length against petal length, with progressive additions: the first shows only positions, the second encodes petal width as point size, the third color-codes points by species, and the fourth combines both size and color. The visualization is built with D3.js v3, using the reusable ScatterPlot module that handles axis creation, scaling, and SVG rendering. It loads data from a CSV file and employs the d3.csv and d3.json APIs to parse the dataset and metadata.