📖 Today’s lesson
Lesson 14: Make the model show its work.
“Step-by-step” forces visible reasoning — for funnel diagnosis, it turns the model from a guesser into a methodical analyst whose logic you can check against your data at every step.
Why this matters: “Traffic’s up but conversions are down” triggers panic-fixes in most teams. A forced diagnostic sequence — segment first, then stage, then hypothesis — replaces panic with method. Halfway point: this is the skill that separates users from masters.