Answer
A driver-based forecast models financial outcomes from a small number of key business drivers (e.g., revenue = units x price; costs = headcount x cost per head), rather than extrapolating each line item. Changing a driver automatically updates the forecast, making it faster, more transparent, and easier to run scenarios—ideal for rolling forecasts.
Revenue = active customers x average revenue per customer.Real-world example Modeling revenue from customer numbers lets the team re-forecast instantly when the customer trend changes.