Feedback Loops
Laws and principles filed under Systems & Complexity / Feedback Loops.
Feedback Loops
Every guide includes meaning, mechanism, applications, limitations, related concepts, and traceable references.
Queueing-system conservation identity
Little's Law
In a stable system over a consistent boundary and time horizon, average work in process equals average throughput multiplied by average flow time.
Cybernetic regulation principle
Ashby's Law of Requisite Variety
A regulator can reliably constrain a system only if its effective response variety is sufficient to counter the variety of disturbances that matter at the controlled outcome.
Cybernetic modeling theorem
Good Regulator Theorem
Every effective and sufficiently simple regulator of a system must embody a model of that system in the sense required to produce successful regulation.
Flow-system constraint principle
Bottleneck Principle
The sustainable throughput of a serial flow system cannot exceed the capacity of its active constraint.