The Natural History Museum was given a once-in-a-lifetime opportunity to overhaul the museum when they were awarded €660 million, one of the largest ever investments in a natural history museum. Spending this money wisely and sensibly, getting maximum return on investment, is no mean feat. The museum had undertaken a series of planning exercises for how they would reshape their organisation, refresh the building and reinvest in the collections. We were asked to stress test the museum’s thinking, validate their hypotheses and turn it into an implementation plan.