Chart Type for Cumulative Changes. Keywords: waterfall, cumulative, variance, incremental, bridge, delta. Best Chart: Waterfall Chart. Secondary Options: Stacked Bar, Cascade. When to Use: Showing how individual positive/negative components add up to a final total (e.g., P&L, budget variance). When NOT to Use: Changes are not additive; more than 12 bars (readability breaks); audience expects a simple total. Data Volume Threshold: 4–12 bars optimal; beyond 12 aggregate minor items into a single 'Other' bar. Color Guidance: Increases: #4CAF50. Decreases: #F44336. Start total: #2196F3. End total: #0D47A1. Running total line: dashed. Accessibility: AA — Color + directional arrow icon per bar (not color alone). Labels on every bar.. A11y Fallback: Table with running total column; directional arrow icons per row. Library: ApexCharts, Highcharts, Plotly. Interactive Level: Hover.