What’s a Design System, Design Language, and Design Language System? And what’s the Difference?

TL;DR: Depending on who you ask, a design system and a design language might be the same thing or not. Regardless, the important point here is that both a system and a language go beyond a simple pattern library. They have to include a set of rules and guidelines to give the included components structure and meaning.

Originally published on 2008 ‒ Tales of Design & User Experience.

Most people concerned with digital design in one way or the other should already have an intuitive understanding of what a design system or a design language is. It’s what Apple’s Human Interface Guidelines are, or Microsoft’s Metro Design Language. I, personally, have heard the term “design language” more often in my career in UX so far, and sometimes “design system”. But a new term I came across for the first time recently was “design language system”. So, I asked myself: Is there actually a difference between these three? What followed was a little literature review of three very useful articles:

• First, A comprehensive guide to design systems by Will Fanguy;
• second, Design Language System by Swetha Suresh;
• and third, What is a Design Language… really? by Nate Baldwin.