After a new system was implemented, it unexpectedly required a receipt for expenses over $10. This wasn't the old policy, but the system was generating policy violations regardless. Thereafter, I complied with policy and dealt with all the tiny receipts. Later, I checked whether I could submit a valid expense over $10 without the receipt. To my delight, the system had been updated to reflect the previously stated policy. I eliminated a large percentage of receipts. Time, energy, space, and paper saved - all because I tested an assumption. This is broadly applicable. As we witness the pace of change, it's wise to consider whether some assumptions might have staled.