Most executives assume that a flawless plan arrives only after every detail has been vetted in real‑time meetings, because the act of discussing feels like progress. The paradox is that the very act of pretending the future is already set blinds teams to the low‑probability, high‑impact risks that only a structured “what‑could‑go‑wrong” session can surface. A pre‑mortem forces participants to adopt the mindset of a skeptical outsider, turning each assumption into a hypothesis to be disproved rather than a truth to be defended.

When Kodak’s camera division convened a pre‑mortem for a new digital prototype, engineers imagined a scenario where the sensor failed under low light, prompting a redesign that later saved the product from a market‑shaking recall. The exercise also revealed a cultural blind spot: product managers habitually dismissed “unlikely” failure modes, so the pre‑mortem gave those voices a formal platform. By surfacing hidden failure points early, the team avoided costly redesign cycles and preserved momentum for the launch.

Yet the benefit stalls when leaders treat the pre‑mortem as a checkbox rather than a genuine search for contradiction, allowing the same optimism bias to creep back in.