VisibilitySystemStatus [fact] v1.0.0

Nielsen Heuristic 1 — Visibility of System Status: The system should always keep users informed about what is going on, through appropriate feedback within a reasonable time.

Confidence

proven

Evidence

@nielsen/source-nielsen-1994

Heuristic Number

1

Violations

• Button that triggers an async action with no loading state — user clicks repeatedly.
• Form submission with no confirmation, leaving user uncertain if it worked.
• Background sync with no indicator that data is being refreshed.

VisibilitySystemStatus [fact] v1.0.0

Nielsen Heuristic 1 — Visibility of System Status: The system should always keep users informed about what is going on, through appropriate feedback within a reasonable time.

Confidence

proven

Evidence

@nielsen/source-nielsen-1994

Heuristic Number

1

Violations

• Button that triggers an async action with no loading state — user clicks repeatedly.
• Form submission with no confirmation, leaving user uncertain if it worked.
• Background sync with no indicator that data is being refreshed.

Examples

• Progress bars, loading spinners, and status messages during file uploads.
• Email client showing 'Sending...' → 'Sent' state change in the toolbar.
• Shopping cart badge count updating immediately after adding an item.

Confidence

proven

Evidence

@nielsen/source-nielsen-1994

Heuristic Number

1

Violations

• Button that triggers an async action with no loading state — user clicks repeatedly.
• Form submission with no confirmation, leaving user uncertain if it worked.
• Background sync with no indicator that data is being refreshed.