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RGM-204 · CRO & Experimentation

CRO & Experimentation

Experimentation is the one marketing discipline that compounds knowledge instead of just spending budget. This course builds a trustworthy program from the ground up: the fundamentals and the five test types, the design and statistics that keep results honest, the prioritization that makes scarce traffic count, the bandits and Bayesian methods for when you need to earn while you learn, and the culture that decides whether evidence actually beats opinion. Six deep modules, hard CASE tests, linked calculators, every claim sourced.

Start Module 1 → Skip to the final exam ⚡ Run the sample-size calculator →
6
Modules
CASE
Test method
90%
To pass
0
You’ve cleared
Start here · the one idea behind all six modules

Replace opinion with evidence — and run the program, not the test

Most ‘optimization’ is redesigning and hoping. Experimentation is different: a controlled test tells you a change actually caused the result, so every outcome — win, loss, or flat — banks a durable fact about your customers. The catch is that roughly two-thirds of good ideas won’t win, so the value isn’t any single test — it’s the compounding knowledge of a program run with discipline.

So this course is built around running the program, not chasing the test. You’ll learn to choose high-leverage tests (Module 1), design and power them so the result is trustworthy (2–3), prioritize ruthlessly when traffic is scarce (4), reach for bandits and Bayesian methods when earning-while-learning matters (5), and build the culture where evidence beats the highest-paid opinion in the room (6). Every module ends with a hard CASE-method test, and the calculators it links are the ones we use on client work.

Getting numbers is easy; getting numbers you can trust is hard.

— Ronny Kohavi, Trustworthy Online Controlled Experiments

Working calculators for this series: A/B test sample size, statistical significance, test duration, ICE score, RICE score, and the experiment planner.

Get certified by a rigorous, end-to-end CRO course

Four steps to your certification

No sign-in, no account. Take the modules in any order, pass the CASE-method tests, and collect a passcode for each. Clear all six plus the final exam and you’re certified.

01

Learn the module

Deep, practical lessons with decoders, linked calculators, and sourced research — no fluff.

02

Pass the test

Hard, scenario-based CASE-method questions. Score 90% to clear the module.

03

Earn a passcode

Each pass reveals a secret code. Save it — re-enter any time to reclaim credit and jump ahead.

04

Get certified

Clear all six modules and the final exam to unlock your certificate.

Already started? Enter a passcode to reclaim credit and jump straight to what you haven’t finished.
Curriculum · jump to any module

Six modules

Fundamentals first, then the design and statistics that keep tests honest, then prioritization, then bandits and Bayesian methods, then the culture that decides it all. Each module ends with a hard, subject-specific test; each pass unlocks a passcode.