Multi-perspective validation that catches your blind spots before you waste months building the wrong thing.
Maciej Jankowski · maciejjankowski.com
Top startup killer. They never asked the hard questions.
Average time on projects that should've died in week one.
Founders make decisions at 80% confidence. They're wrong 80% of the time.
"If just 1% of the market..." is how every failed startup begins.
Beautiful pricing page. Negative margins underneath.
The spreadsheet solution that's "good enough."
Your brain is wired to protect your idea from criticism.
9SENS puts every assumption through multi-perspective analysis. Each persona attacks from a different angle. The ideas that survive are worth building.
Adversarial personas
Cognitive bias detectors
Mental models
Each one attacks your idea from a different angle. They argue with each other. The friction is the point.
Evidence? Source? Tested? Kills bullshit before it becomes strategy.
Show me the money. ROI, unit economics. No hand-waving.
Who else is doing this? What happens when they copy you?
Positioning, blue ocean, value curve. Where do you play?
5-tier credibility system. Peer-reviewed or Reddit hearsay?
Pre-mortem. What kills this in 6 months?
+ 28 more specialized personas across strategy, technology, research, marketing, and adversarial testing.
Market sizing, competitor analysis, failure study · Budget: $0 · Gate: TAM ≥ $1M
Customer interviews (strangers only), pain validation · Budget: ≤$50 · Gate: 5+ confirm pain & pay
MVP scope, unit economics, business model · Gate: ROI ≥ 1.5x, Margin ≥ 40%, LTV:CAC ≥ 3:1
Build MVP, deploy, first real user · Gate: deployed, 1+ user, metrics tracked
10+ users, actual vs projected unit economics · Gate: retention ≥ 40%, actual LTV:CAC ≥ 2:1
What assumptions were wrong? Framework learns from every project.
"AI agreed with me" is the most dangerous sentence in business validation.
Tech founder with multiple ideas competing for attention.
Full 9SENS analysis identified the one idea with real market potential. Killed 3 zombie projects draining energy. Clear roadmap with risks identified and mitigated. Now building with confidence instead of doubt.
Entrepreneur from Chicago. Trust-based social network concept.
Uncovered 12 critical risks that would have killed the project post-launch. 8 mitigated through design changes. 4 flagged as decision points with clear criteria.
15-min call. 5-persona quick scan. GO/NO-GO verdict. Top 3 risks. 1-page summary.
45-min deep dive. Full 34-persona analysis. Risk assessment + mitigation. 10+ page report. 30-day support.
Weekly calls. Unlimited analyses. Pivot/persevere decisions. Direct access.
15-minute adversarial analysis. First one's free.
maciejjankowski.com · 9SENS Framework v2.1