Funnel Analysis
The process of mapping and measuring user progression through a series of steps toward a conversion goal, identifying where and why users drop off.
Funnel analysis is the foundational skill of conversion optimization. Before you can improve a conversion rate, you need to know where users are dropping off — and a funnel gives you that map. Every CRO analyst interview will ask about funnel analysis, and every experimentation program starts with one.
Building an Effective Funnel
A good funnel isn't just a sequence of pageviews. It's a behavioral model: what steps does a user take, in what order, to reach a conversion goal? The steps should be meaningful decision points, not arbitrary page loads.
For e-commerce: Product View → Add to Cart → Begin Checkout → Enter Payment → Complete Purchase. For SaaS: Landing Page → Signup → Onboarding Step 1 → First Value Action → Paid Conversion.
The 80/20 Rule of Funnel Optimization
In my experience, 80% of the conversion lift comes from fixing the biggest single drop-off point. Don't try to optimize every step simultaneously. Find the step with the largest absolute drop-off (not percentage — absolute numbers), diagnose why users leave there, and fix it. Then move to the next biggest drop.
What Hiring Managers Look For
When interviewing CRO analysts, I look for candidates who can: (1) define meaningful funnel steps, (2) distinguish between micro and macro conversions, (3) segment funnel performance by traffic source, device, and user type, and (4) translate drop-off data into testable hypotheses. The last skill is the rarest and most valuable.