# Control Theory **Domain:** Systems Engineering, Electrical Engineering, Mathematics **Doc Type:** Concept Node **Classification:** Infrastructure Concept **Maturity:** Foundational **Related:** [[Feedback Systems]], [[Equilibrium Theory]], [[Coordination Systems]], [[Data Assimilation]] --- ## Definition The **mathematical and engineering discipline concerned with designing systems that maintain specified outputs (targets) despite disturbances or variations in inputs**. Control theory uses feedback mechanisms, error correction, and adjustment algorithms to keep dynamic systems operating within desired ranges. --- ## General Context Control theory originated in engineering (thermostats, cruise control, aircraft autopilots) where the goal is to maintain system variables within acceptable ranges despite environmental fluctuations. Controllers use sensors to measure current state, compare it to desired state, and generate corrective actions. --- ## Governance Context Climate governance increasingly uses control theory language: targets (2°C, net-zero), monitoring systems (satellites, sensors), and adjustment mechanisms (carbon pricing, adaptation measures). But governance differs from engineering: targets are politically contested, measurement is disputed, and adjustment authority is fragmented. --- ## Computational Governance Context Computational governance systems that implement closed-loop control require continuous sensing, rapid processing, and actuators capable of system-wide adjustment. This concentrates power in whoever controls the feedback mechanism. --- ## Nash Equilibrium Context Nash equilibrium in strategic interaction differs from control theory's equilibrium: Nash equilibrium is a point of mutual stability where no actor wants to unilaterally deviate. Control theory equilibrium is maintained through external correction. --- ## Key Insight Control systems require feedback (measurement of actual state), comparison to targets, and authority to adjust system variables. Applied to governance, control theory raises critical questions: who sets the targets, who has measurement authority, who controls adjustments? --- ## See Also [[Computational Architecture]], [[Nash Equilibrium]], [[Continuous Adaptive Management]]