Riskiest assumption

The one belief that, if false, ends the idea. Test it first.

Every business idea rests on a stack of assumptions: who has the problem, that they pay, that you can reach them. They are not equally dangerous. Finding the one that would kill the idea and testing it cheaply beats building the whole thing and finding out at launch.

Share: LinkedIn · X ·

Related terms

MVP (minimum viable product): The smallest version of a product that tests whether people want it enough to use or pay.
Reference class forecasting: Estimating from what similar finished projects actually cost, instead of from your own feature list.

← All terms

Need this built, fixed or reviewed?

I build and rescue products with AI coding agents under rules: AI features in production, honest estimates, email that gets delivered.

Book a free 30-min call See price and start date

How I work

Przemysław Zalewski · 15+ years shipping software

“a true bias for action” client CTO, public LinkedIn recommendation

Confidential by default. NDA is standard. I never show your project, name or screenshots without written consent, which is why this site names no clients without permission.
Your code, your accounts. Code and data stay in your repository and accounts. AI tools run with training on your data turned off, and secrets never reach a model.
A handover you can use. Every project ends with the same checklist: a README that gets it running, one architecture diagram, written decisions, CI, a runbook and a recorded walkthrough. It is done when someone outside the project can run it from the docs.
Boring technology where it counts. I pick a stack you can hire for. Anything experimental needs your yes and an exit plan.
Approach matched to your risk appetite. Prototype, product or regulated: the level decides how much autonomy the agents get and how much review and validation each change needs.
Everything checkable. Every number on my pages links to its source. My tools are free, and the idea validator skill is open source (MIT).

All principles and risk levels →