So What Test
Reject ideas that cannot justify their value in one clear sentence
- Difficulty
- Starter
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 99%
The So What Test is Kilgore's fast screen for candidate ideas. State the idea, ask 'So what?', and require a one-sentence explanation of why it should exist or why anyone should care. Failure to answer clearly means the idea is not strong enough. Passing does not require immediate action: Kilgore also lets ideas sit, observing that average ones tend to disappear while stronger ones keep returning to mind. A final founder-fit check asks whether she would buy the product herself, which helps her work from a need she understands. Together, the rule combines immediate value clarity, time-based persistence, and honest personal demand. It is an initial filter, not proof of market demand.
Origin
Kilgore names the test while explaining how she filters the many ideas she records after selling or building businesses.
Core principles
- 01An idea must give people a reason to care
- 02Clarity exposes weak value propositions
- 03Time helps mediocre ideas lose their grip
- 04Founder demand is useful only when it is honest and relevant
How to run it
- 1
State the idea
Describe the proposed product, service, or project without promotional padding. Make the object of the decision clear.
Watch out Complex wording can conceal an unclear idea.
- 2
Ask 'So what?'
Challenge the idea's significance rather than defending it. Focus on why it should be done and why anyone would care.
Pro tip Ask the question as if the idea belonged to someone else.
- 3
Demand one sentence
Explain the value in one sentence. If a clear answer is unavailable, reject or rework the idea.
Watch out A long explanation may be rationalisation rather than clarity.
- 4
Let it persist
Give a passing idea time to settle instead of acting immediately. Notice whether it keeps returning after weaker ideas fade.
Watch out Persistence in your mind is a filter, not market validation.
- 5
Check founder fit
Ask whether you genuinely understand the need and would buy the result yourself. Use that knowledge to judge quality and relevance honestly.
Pro tip Apply this check only where your own needs resemble the intended customer's.
Watch out Your preference alone does not prove that a market exists.
In the wild
Kilgore says Beauty Pie was straightforward for her because she loves beauty products, candles, and supplements, knows the laboratories, already buys these goods, and wants high quality without paying retail prices.
→ The idea had a concise customer benefit and strong founder-product fit.
Kilgore says she could not find shoes that felt comfortable while still fitting her interest in fashion. The idea addressed a need she personally understood.
→ A concrete unresolved problem gave the product a reason to exist.
Common mistakes
Explaining instead of answering
A sprawling defence can disguise the absence of a clear reason for anyone to care.
Acting on every passing idea
Kilgore lets ideas sit because average ones often fade without requiring action.
Mistaking self-interest for demand
Wanting a product yourself can improve founder fit, but it does not establish a wider market.
Is it for you?
Best for
It is best for founders and creators choosing among many possible projects.
Not ideal for
It is not ideal as a substitute for real customer evidence once an idea has passed the initial screen.
From the transcript
“there's something I call the so what test”
“if you cannot explain why you would want to do that or why anybody should care in one sentence it's not a good enough idea”
“I only sell stuff that I would buy”
From the episode
How I Built 5 Multi-Million Dollar Companies: Marcia Kilgore