Confirming what happened.
THE PRINCIPLE
Every action must produce a visible response.
WHY
Without it, people repeat the action or assume failure.
WHAT TO SHOW IMMEDIATELY
That the press registered.
WHAT TO SHOW DURING
That something is happening, if it takes more than a moment.
WHAT TO SHOW AFTER
What the result was.
WHAT TIMINGS MATTER
Under a fraction of a second feels instant Beyond a second, show progress Beyond several seconds, show what is happening and roughly how long
WHAT TO AVOID
Silent success, which leaves doubt An indicator that never resolves Blocking everything for a background task
WHAT TO DO ON SUCCESS
Confirm briefly, and show the result.
WHAT TO DO ON FAILURE
Say what failed and what to do.
WHAT TO PRESERVE
Whatever the person entered.
WHAT TO BE CAREFUL WITH
Confirmations that disappear before being read Confirmations for trivial actions, which become noise
