The Evidence Ladder: Why Code is the Most Expensive Way to Test a Hypothesis

Every organisation says it is customer-led. Few can show the evidence that justified their last major build. Instead, roadmaps are funded by conviction: a compelling deck, a senior sponsor, a competitor announcement.

The Evidence Ladder reframes the question. Rather than asking whether an idea is good, it asks what level of evidence currently supports it, and what the cheapest experiment is that would move it one rung higher. Stated interest sits at the bottom. Commitment, payment, and verified compliance sit near the top.

Code belongs at the top of the ladder, not the bottom. When teams climb in order, they discover most of what they need to know before an engineer writes a line, and the builds they do commission are smaller, sharper, and far more likely to survive contact with the market.