Design

A/B Test Design Studio

A/B testing turns opinions into evidence. But poorly designed tests waste time. This exercise teaches you to design A/B tests that provide real answers. You'll learn to create solid hypotheses, meaningful variants, and achieve statistical validity.

Duration
3 hours
Group Size
4-6
Category
Design
Difficulty
Easy
Participants will:

  • Form testable hypotheses for A/B experiments.

  • Design clean variants that isolate variables.

  • Calculate sample sizes and test duration.

  • Plan analysis approaches that avoid common pitfalls.

  • Document tests for learning.

Participants will produce:

  • An A/B test design with a clear hypothesis.

  • Clean variants that isolate variables.

  • A statistical plan for valid results.

  • Documentation for organizational learning.

Common mistakes to watch for:

  • Testing too many variables at once dilutes results.

  • Stopping tests too early leads to false positives.

  • Ignoring statistical significance creates uncertainty.

  • Poor documentation hampers future learning.


Key questions to consider:

  • Is A/B testing the right approach?

  • Do we have enough traffic to get results?

  • How long until we can expect results?

  • What actions will we take based on each potential outcome?

Conducting the Exercise:

  1. Hypothesis Formation (30 minutes)


  • Identify the decision to be made.

  • Form a testable hypothesis.

  • Define primary and secondary metrics.

  • Document the action for each possible result.


  1. Variant Design (45 minutes)


  • Design control and treatment variants.

  • Ensure only one variable differs to isolate causation.

  • Create designs for all variants.

  • Document the exact differences.


  1. Technical Planning (30 minutes)


  • Calculate the required sample size.

  • Determine the test duration.

  • Plan traffic allocation.

  • Identify technical implementation needs.


  1. Analysis Plan (30 minutes)


  • Define the statistical significance threshold.

  • Plan segmentation analysis.

  • Identify potential confounds.

  • Document decision criteria.


  1. Test Documentation (45 minutes)


  • Create a test brief with all details.

  • Write a results template.

  • Plan a communication strategy.

  • Schedule check-in and analysis dates.

Unlock Step-by-Step Instructions

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For Facilitators

  • Review participant profiles and expectations
  • Prepare all materials and supplies
  • Test technology and room setup

For Participants

  • Complete pre-session survey
  • Review background materials
  • Prepare examples or case studies

Unlock Pre-Work Requirements

Create a free account to access step-by-step instructions, agendas, and resources for all activities.


  • Sample size calculator

  • Test documentation template

  • Hypothesis template

  • Design tools for variant creation

  • Comparison mockups

  • Technical specification template

Unlock Materials Required

Create a free account to access step-by-step instructions, agendas, and resources for all activities.

A/B Test Calculator
Sample size calculator for A/B tests.
Optimizely - A/B Testing Guide
Comprehensive guide to A/B testing methodology.
VWO - A/B Test Design
Guide to designing effective A/B tests.

Unlock Resources & Templates

Create a free account to access step-by-step instructions, agendas, and resources for all activities.

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