A design system is easy to start and hard to keep. Six months in, teams have forked components locally, half the product uses old tokens, and the documentation describes an interface that no longer exists.
Tokens before components
Colour, spacing, typography and radius defined once and referenced everywhere give you consistency even where components diverge. They are also the cheapest thing to adopt incrementally — a team can switch to tokens without adopting a single component, and the product looks unified immediately.
Tokens buy consistency before anyone agrees on components.
Extract components, do not invent them
Systems built speculatively produce components nobody needs and miss the ones everyone builds by hand. Wait until the same pattern appears three times, then extract it. The result is smaller, better fitted, and adopted without persuasion because it matches what teams were already building.
Provide an escape hatch
A component that cannot be adapted gets copied and modified locally, and now you have two. Allowing className overrides or composition slots keeps teams inside the system when their case is genuinely different, which is far better than pushing them out of it.
Documentation lives with the code
A separate documentation site is a second thing to update and the first thing to fall behind. Keep usage examples alongside the component so that changing it and changing its documentation are the same commit. Stale documentation actively harms adoption — people stop trusting it entirely.
Someone must own it
Design systems maintained by everyone are maintained by nobody. A named owner with allocated time to review contributions, handle deprecations and communicate changes is the difference between a system that grows and one that fragments quietly across three product teams.
Deprecate visibly
When a component is superseded, mark it deprecated with a console warning and a migration note, keep it working for a defined period, and track remaining usage. Removing something teams still depend on is how a design system acquires a reputation for breaking things.
