This visualization plots 39 monthly data points and computes control limits using a moving range approach. It identifies breakpoints where the process shifts, applying three rules: points exceeding 2.66 times the average moving range, two of three points beyond 1.98 sigma, and seven consecutive points above the mean. The code uses d3.csv, d3.mean, and array methods to calculate lower and upper bounds, rendering the series with D3 v6.