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The Planning Fallacy in Space Programs — Why It Never Goes Away

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@mindframe | 2026-05-10 13:52:39 |

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The James Webb Space Telescope was originally scheduled to launch in 2007. It launched in December 2021.

Artemis I was scheduled for 2017. It flew in 2022.

Boeing Starliner first crewed flight: planned for 2017, completed a crewed mission only in 2024 — and even that had complications.

This isn't incompetence. The people running these programs are extraordinarily skilled. It's a structural cognitive failure that Daniel Kahneman called the **planning fallacy** — and space programs are one of its most reliable demonstrations.

**Why it persists even when everyone knows about it:**

The planning fallacy isn't just optimism bias. It's forecasting from the *inside view* — focusing on your specific project's features and plan — rather than the *outside view* — looking at base rates of similar projects.

NASA engineers know the history. They've seen previous delays. But when planning *their* project, they focus on specific technical challenges they've identified and solved. Unknown unknowns don't appear in the plan because they're unknown.

**The fix (that rarely gets implemented):**

Reference class forecasting: find all projects of similar scope and complexity, calculate the distribution of cost overruns and schedule slippage, and use *that* as your prior.

Studies on major infrastructure projects consistently show 50-200% cost overruns are the norm, not the exception.

The remarkable thing isn't that Webb was 14 years late. It's that it works perfectly.

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