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A/B Testing Made Easy


Chris Castiglione
Co-Founder, One Month (YC-backed learning platform)

Questions? Read our FAQs

About This Class

Have you ever found yourself examining your website and wondering which design variation of your site is attracting the most sales? Or if your email signup button is in the correct place? A/B testing is a simple way to test a new website design and allows you to test variations live on your site with your actual users. Optimizely is a tool for A/B testing that takes the guesswork out of website optimization. In this livestream, you’ll set up the Optimizely editor, run experiments, and learn how to get started testing text, images, colors, and new arrangements of content.


  • Introduction 0:52
  • Vocabulary 0:23
  • Why A/B Testing 9:22
  • Setting Up an Optimizely Experiment 12:58
  • Colin Nederkoorn Interview 14:53
  • Charlotte Weiskittel Interview 10:12
  • Implementing the Project Code 3:07
  • Q: What should I test? 1:49
  • Q: Can I specify the amount of traffic that comes into my experiment? 1:18
  • Q: What affect does java script project code have on page performance? 1:55


  • Learn how to get started running an Optimizely A/B test, what you can/should test with Optimizely, and how long you should run the test for.
  • Find out what the difference is between A/B testing and multivariate testing.
  • Learn where to put the JavaScript snippet.

About the Instructor(s)


Chris Castiglione
One Month (YC-backed learning platform)

Christopher Castiglione is a developer with a specialty in UX strategy and Front-end. He has over ten years of experience developing digital products. In the past, he has designed applications for clients ranging from The Black Eyed Peas, Bacardi, and Toyota.

In 2012, Christopher spoke at over 70 events on programming and APIs. He's taught at Columbia University, The University of Amsterdam, SXSW, and has provided corporate training for clients ranging from Donors Choose to The New York Stock Exchange and American Express.

Chris is currently a member of the General Assembly teaching faculty. More information can be found here.

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