Evidence Depth Ladder

The Evidence Depth Ladder ranks research inputs by how much they can be trusted when a client challenges a recommendation. Rung one is self-reported data: survey answers, form responses, stated preferences. Rung two is observed behavior: session recordings, click paths, drop-off points. Rung three is verified outcome: what actually converted, renewed, or paid. Most agency research stacks stall on rung one because forms are cheap and fast, and the resulting decks collapse the moment a client asks why. The framework's rule is that no strategic claim ships on a single rung. Pair a Typeform intake with behavioral evidence before writing the recommendation, and treat tools that only capture stated intent (IdeaStream's Reddit and search-trend signals, for instance) as hypothesis generators rather than proof. The ladder also sets retainer pricing: rung-three evidence commands diagnostic fees, rung-one evidence gets bundled into project scope. Agencies that climb deliberately can defend a recommendation in a renewal meeting instead of re-running the study.