AD is a convention to organize the interfaces design patterns in a hierarchic system.
It uses the Atoms / Molecules / Organisms allegory.
The goal is to share a language between designers, developers, stakeholders regardless of there technical background (technical teams, creative teams, stakeholders ...etc). AD was introduced by Brad Frost
A bottom up approach
ADS invite us to create the more global, smalls, atomics parts first and using them as building blocks for higher-level entities, and repeating the process to produce pages.
We will se later how we integrate ADS to our CSS architecture, and even slightly deviate from the original definition.