Most founders think the first step after getting an idea is to build an MVP or run outside the building to start testing with customers.
I used to think the same way. Back in 2009, when I first learned about customer development and lean startups, I immediately started lining up customer interviews for a photo sharing product I was working on. I got enough people to “validate the problem,” built an MVP, and even got paying customers. By all accounts, I was doing everything by the book.
Then an advisor destroyed my business model in less than 5 minutes. Using just a handful of key metrics, he showed me the model was broken. While this was certainly bad news, the conversation helped me confront reality and make a hard pivot. But what bothered me even more was the 9 months I wasted pursuing a flawed business model that I could have avoided if I knew about this 5-minute stress test.
That experience changed how I approach every new idea.
Why Stress Test Before You Validate
The problem with rushing to validation is two-fold.
First, most starting ideas are too vague or fuzzy. You can’t test a vague idea.
Second, many foundational risks can and should be stress-tested inside the building because they make your idea more bulletproof and validation-ready. They help you avoid wasting resources on sub-optimal ideas.
Think of stress tests as business model simulations. Each one applies stress on a specific dimension of your business model — like desirability, viability, or feasibility — and helps you expose obvious cracks so you can fix them before you invest significant time, money, and effort.
The best part: these tests can be done as thought experiments. They don’t replace customer validation. They prepare you for it.
The 7 Dimensions
Here are the seven dimensions I now apply to every new idea:
1. Mission
Why this idea, for you? The primary deliverable here is a concrete Minimum Success Criteria (MSC) — the smallest outcome that would deem your project a success 3 years from now. For LEANSpark, my initial MSC was $1M ARR, which I later 10x’d to $10M ARR after running the viability stress test.
2. Clarity
Most ideas start out as many possibilities mixed together. The clarity test splits them into focused variants so each canvas has a single business model that is concise, precise, and complete.
3. Desirability
This dimension checks for customer demand using the Innovator’s Gift concept: all new problems worth solving come from addressing old problems with new innovative solutions. It ensures you have an old way defined, you outline what’s broken with it, and you articulate how you’re significantly better to cause a switch.
4. Viability
This is the dimension that kills or pivots more ideas than any other. The rapid viability or Fermi test uses your pricing model assumptions and MSC to check if your target market is big enough to hit your goal. Simple math, but it forces hard decisions.
5. Feasibility
This is where you turn your big, ambitious goal into smaller, more actionable 90-day goals and experiments. It helps you chart a year-by-year traction roadmap and confront whether the scope is realistic.
6. Defensibility
Moat building is about creating deterrents to being copied by incumbents or copycats. Good unfair advantages don’t come from features but from things that cannot be easily copied or bought — personal authority, proprietary data, network effects.
7. Timing
Hard to time perfectly, but you can check for markers: inflections (technology shifts), impacts (new possibilities customers are already realizing), and insights (contrarian founder beliefs that shape product and strategy).
How This Played Out with LEANSpark
When I ran LEANSpark through these stress tests, the very first one — clarity — flagged something immediately: my canvas contained 3 distinct business models mixed together. One for founders, one for coaches (incomplete revenue model), and one for investors (no clear monetization).
If I had skipped stress testing and gone straight to customer interviews, I would have gotten confusing signals. Some would want self-service. Some would want white-label. I would have been validating 3 businesses at once without realizing it.
The viability test was equally eye-opening. At $1,000/year pricing and a $10M ARR goal, I need 10,000 customers. With a 1% conversion rate, that requires a top-of-funnel of 1 million founders. The total addressable market of founders is 10-100 million startups created globally each year. Hard numbers, but not impossible.
Most founders take 2-4 weeks to work through all seven stress tests. With structured tooling, I believe you can compress that to hours or days.
The Takeaway
Slow down just enough to ensure you’re not blindly rushing into a hairpin turn on a race track. Stress tests don’t replace customer validation — they make it dramatically more effective by ensuring you’re testing a focused, viable, and well-designed business model.
That 5-minute stress test from 2009 became the first of 7 foundational stress tests I now apply to every new idea. They have saved me far more time than they have ever cost.
I walk through this framework in detail in Episode 2 of Building LEANSpark.