This visualization displays a project’s progress over time as two S-curves: a dashed blue line for planned cumulative progress and an orange area with a solid line for actual progress. Both curves are derived from the ProgressData.csv file, which contains monthly plan and actual percentage values from January 2021 to March 2024. The chart updates dynamically through D3 v7’s general update pattern, using `d3.line` and `d3.area` generators with a basis curve, while `d3.scaleTime` and `d3.scaleLinear` map dates and cumulative percentages. An interactive zoom feature, powered by `d3.zoom`, allows panning and scaling the chart’s x and y axes independently.