99% at every step. Why only 93% at the end? A warehouse running 99% accuracy at receiving, putaway, picking, and packing sounds pretty tight. Four steps, four nines. But if you actually multiply those out — 0.99 × 0.99 × 0.99 × 0.99 — you land at 96%. Add a fifth step like a transfer or a label scan and you're in the low 90s. That's not a disaster scenario. That's a normal operation with no single obvious failure point, bleeding out slowly across every shift. This is why 'our