Business Core · Finance · Module

Forecasting

A current estimate of where the numbers are heading, updated as the world changes. Distinct from the budget, which is a commitment.

The idea

How it works

Confusing the forecast with the budget corrupts both. A forecast that must match the budget stops being an estimate, and the organisation loses the only instrument that would have given it warning.

Forecast accuracy is measurable and almost never measured. Recording what was predicted and comparing it to what happened is the single change that most improves forecasting, and it requires no new method.

Working with it

In practice

  1. 01

    Keep the forecast separate from the budget

    One is an estimate, the other a commitment. Merging them destroys the estimate.

  2. 02

    Roll the horizon forward

    Twelve months ahead, updated quarterly, rather than a horizon that shortens to nothing by December.

  3. 03

    Record the accuracy

    What you predicted against what happened. Consistent bias is correctable once visible.

  4. 04

    Forecast a range where uncertainty is real

    A single number implies a confidence that rarely exists.

One level in

The components of forecasting

A component is something that exists afterwards which did not exist before — a deliverable or a mechanism, not an intention.

  1. The forecast

    Current estimate over the rolling horizon, with assumptions stated.

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  2. The scenario set

    Alternative paths worth planning for, with what would trigger each.

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  3. The accuracy record

    Past forecasts against outcomes, so bias becomes visible.

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A forecast required to match the budget stops being a forecast. Keep them separate on purpose.