Find the Fatal Flaw

Identify the single most fatal flaw in a business plan — the one assumption that, if wrong, collapses the entire model.

Skills Tested

Business model analysisUnit economicsSingle-point-of-failure identification

Challenge Prompt

This is the example prompt structure. Write your own variation below.

Business plan summary: A startup will build an app that pays users £0.10 per minute to watch local business ads. Revenue comes from selling ad slots to businesses for £5 CPM. Target: 100,000 daily active users in year 1, average 30 minutes/day viewing.

Task: Identify the single most fatal assumption. Structure: (1) state the assumption in one sentence, (2) calculate what happens if it's wrong, (3) explain why it's fatal (not just a risk). Do NOT list multiple flaws — find the single worst one.

Your Prompt

Write your own version. Every word matters — be specific.

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Reward

+200 GeraCoins

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Hints (3)

1"Do NOT list multiple flaws" forces prioritisation — the hardest and most valuable skill.
2The fatal flaw here is unit economics: £0.10/min × 30min = £3/user/day, but CPM revenue = £5/1000 views = £0.005/view.
3"Calculate what happens" forces numerical reasoning, not just narrative.