The following is a guest post by Daniel O’Connor. Daniel shares more about OUI, the UI library by Optimizely Tom Genoni introduced in Part 1.

Over a year ago we set out on a mission at Optimizely to unify our product design and get a handle on our ever-increasing CSS payload. Fellow UI Engineer Tom Genoni spearheaded this effort in 2014 and created our Sass framework called OUI.

We first integrated OUI into a small part of the Optimizely application and gradually added it to the entire A/B Testing product in the months that followed. We have since developed an entire new product, and a handful of smaller ones, using the framework. This increase in scope presented unique challenges and required us to improve our implementation strategy.

In Part 1, Tom wrote about the high-level steps it took to build and evangelize OUI. In this post I