A business that only watches totals knows it got 40 bookings from 2,000 visitors and feels vaguely dissatisfied. A funnel view knows 2,000 visited, 400 reached the booking flow, 90 started it, 40 finished. Suddenly the problem has an address: the collapse between started and finished is where half the revenue is leaking, and no amount of extra traffic fixes a broken step.
Instrument each transition, then compare against intent. Losing 80 percent of homepage visitors is normal browsing; losing 55 percent of people who started checkout is a five-alarm fire, because those people had decided. The booking flow behind Book With NAV was engineered around exactly this math, which is why finishing it takes about two minutes.
Fix the deepest leak first, because improvements multiply through every later step. Then respect the funnel's shape: each step should ask for the minimum needed to reach the next, price clarity before commitment, contact details before the essay question. Funnels fail when a step demands more trust than the visitor has earned yet.
Shapes vary too much by industry for universal numbers. The useful discipline is measuring your own steps and attacking the sharpest drop, whatever it is.
Real journeys wander, but the step math still governs revenue. Treat the funnel as measurement scaffolding, not a theory of human behavior.
Event tracking on the handful of steps that matter, which lightweight analytics handles. The instrumentation is an afternoon; the findings usually pay for years.
Everything in this glossary, we build and operate for real businesses. Thirty minutes maps it to yours.