The method starts by identifying the 10 to 20 variables that actually move the business. A SaaS company might plan revenue as reps multiplied by quota multiplied by attainment, and support costs as tickets per customer multiplied by cost per ticket. When sales changes its hiring plan, the revenue and cost lines recalculate without finance rebuilding the model.
The payoff is faster reforecasting and plans that operators recognize, because the inputs are numbers they own. The risk is over-engineering: a model with hundreds of drivers is as hard to maintain as the line-item budget it replaced. Most teams keep drivers coarse for small cost centers and detailed only where the money is.
In software: driver-based modeling is the core design of platforms like Pigment and Anaplan, where formulas connect operational and financial dimensions natively. Prophix and Vena support driver logic on top of structured templates, which suits teams moving up from spreadsheet-based budgets.
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