The document summarizes the evolution of Carbon Design System, IBM's design system created to provide consistency across 130+ teams. It started in 2014 with a small team and focused on developing core components. Over time, the team grew Carbon to include design kits, templates, add-ons and other resources. They also open sourced the system and maintained it through documentation, contributions and bug fixes. The talk highlights lessons like starting small, anticipating future needs, and dedicating time to maintenance as the system and its user base expands.