# Error Signal **Domain:** Control Theory / Measurement **Doc Type:** Concept Node **Maturity:** Developing **Related:** [[Feedback Channel]], [[Educational Telemetry]], [[Control Systems]], [[Russia and Prussia Kybernetiks]] --- ## Definition A representation of the difference between a measured system state and its [[Setpoint|reference condition]]. ## Kybernetiks Context Grades, test results and performance indicators become error signals when institutions use them to trigger correction, ranking or rerouting. ## Backlinks [[Russia and Prussia Kybernetiks]] · [[articles/Russia and Prussia Kybernetiks|Russia and Prussia Kybernetiks]]