When to Use Waterfall Charts vs. Bridge Tables in Procurement Reporting
Waterfall charts communicate narrative; bridge tables support audit. Choosing the wrong format slows steering committees and invites finance pushback.
Steering committees sit at different points on the spectrum between narrative and audit. Your chart format should match where your audience sits—not what looks best in a design portfolio.
Waterfall charts for narrative sessions
Use a waterfall when the CFO already trusts your methodology and needs to see how baseline flows through price, volume, mix, and initiative impact in a single glance. Limit to five to seven steps; more bars and the story collapses. Label each step in plain Korean business English your category managers actually use in meetings.
Bridge tables for audit and follow-up
When internal audit or finance controllers will request PO-level support within 48 hours, lead with a bridge table in the appendix and keep the waterfall as a summary slide. Tables tolerate more line items and survive email forwarding without losing context.
Hybrid approach we recommend
Dashboard page one: waterfall with top five drivers. Linked tab: full bridge with drill-through to supplier and PO detail. Category managers get the narrative; controllers get the evidence—without maintaining two conflicting numbers.