We draw the thing before it is built, then sit with the people who have to build it. Flows, states and the awkward cases that only appear once something is real.

One set of tokens, components that agree with each other, and documentation a new hire can follow on their first afternoon.

Sites that load quickly on a bad connection and keep working when the script fails. Semantic markup first, JavaScript where it earns its place.

Type, colour and voice worked out together, with the rules written down so the fifth page still looks like the first.

Prototypes you can click, timed and eased properly, so a decision about how something feels is made before it reaches production.