Quick Reference: Driver Tree Design Rules
Recall the rules that keep a driver tree useful instead of bloated.
What is the best test for whether a model split deserves to exist? Would a movement in that split change a real management decision or forecast action? If not, the split may belong in reporting rather than in the planning spine. Detail decision Economic difference matters more than org-chart difference. “Let’s add every possible cut now so we never need to rebuild the file later.” Finance reply Extra detail only helps if it changes decisions; otherwise it slows every cycle and makes the forecast staler. Completeness can lower accuracy when it delays updates. It reframes complexity as an operating cost,…
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