One RGB LED Is Enough When Its States Are Designed
A single status light can become confusing if color, blink and priority are not treated as a protocol.
UX
Dashboards Should Follow Troubleshooting Workflows
A wall of attractive graphs is slow during an incident if related signals are scattered by exporter rather than by the question an operator is trying to answer.
Physical Controls Are Part of the Reliability Model
A voice device should remain operable when the display is slow or partially refreshing.