How to evaluate, filter, and fund startup ideas that actually work

Executive overview

Most founders execute on too many ideas, too fast, with too little equity left when they exit. Martin Warner argues that rigorous idea filtering — before any resource is committed — is what separates serial success from serial failure.

Ideas fall into three tiers: incomplete (discard), scoped but missing the middle (park), or fully clear with known resources and a visible end (execute now). Only the third tier justifies immediate action.

The goal is to stay small, preserve equity, and build asset value before raising capital.

Filtering ideas: the pyramid framework

• An idea with no visible scope or end: discard it — if it matters, it will return
• An idea with a clear top and foundation but missing middle: log it, let it mature, revisit
• A great idea has a known start, known resources, visible endpoint — execute immediately
• Maintain an ideas list (Warner keeps 1,268); cull ruthlessly and let categories emerge over time
• Ideas in the same category often interconnect and create compounding opportunities

Evaluating whether an idea is worth pursuing

• Validate everything before committing time, money, or resources
• Ask: can I see the full pyramid — foundation, middle, and peak?
• Assess what it will take in terms of capital, skills, and timeline before starting
• Categorise ideas (aviation, AI, entertainment) so related ideas can be spotted as a cluster

Preserving equity and controlling dilution

• Build toward proof of concept or first monetisation before raising outside capital
• Use savings, friends and family, or sweat equity to delay dilution
• Count your funding rounds carefully — each round erodes founder ownership
• The world is full of founders who grew a great company but own almost none of it at exit
• Stay small as long as possible; reuse assets; do more with less

Fundraising tactics that get meetings

• Study the investor's portfolio and identify their areas of competence
• Show them something they already believe in, then explain why yours improves on it
• One-on-one selling: identify a comparable, promise an improvement — that gets you in the door

Types of companies and economic levers

• Not all companies optimise for scale — intellectual property, social capital, and network businesses follow different logic
• Network businesses can be the largest companies in the world or small, highly connected ones
• Economic levers include sweat equity, bank loans, donations, advertising, and ancillary revenue — not just VC
• Match the funding model to the type of company, not the other way around

The fast-build risk: lessons from BotObjects

• BotObjects built the world's first full-colour desktop 3D printer in 17 months
• Fast pace led to aggressive competitors, distrustful media, and complex decisions under pressure
• Two core risks in rapid builds: unproven scaling triggers and compounding decision-making errors
• Today, an 8–10 year path to a billion-dollar valuation is more achievable than a 17-month $50M exit

Teaching and the step diagram

• Warner's framework teaches founders to set up a company exit-ready from day one
• Key steps: structure for exit, build, monetise customers, reuse assets, stop when the problem is solved
• Stop when you've solved the problem — then go solve another one
• YouTube is useful but insufficient; the underlying theory of selling, marketing, and fundraising has not changed