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What Is the Planning Fallacy and Why Projects Always Run
Correction Concepts

What Is the Planning Fallacy and Why Projects Always Run

Corrected by Emir Baycan · on When Notes Fly · 12 July 2026 · View published page ↗

The planning fallacy explains why projects consistently take longer and cost more than planners expect, and how reference class forecasting corrects it.

Factually incorrect

Changes accepted

2 edited

Computed from the content the publisher accepted, line by line. Neither the contributor nor CitePep writes this diff by hand.

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−The Sydney Opera House, estimated at £7 million, cost £102 million
+The Sydney Opera House, estimated at about AU$7 million, cost about AU$102…
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−they increased their estimate to eight years. The project ultimately took ten
+they increased their estimate to eight years. The project ultimately took eight

Why this is better

Verified both corrections already correctly applied in the article body (AU$ currency for Sydney Opera House; 'took eight' for the curriculum project). No other mentions elsewhere in article. FAQ field checked, does not reference either fact. No changes needed.

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