Observe a loop
Identify the system, the environment, the action and the signal returned after that action. Feedback is meaningful only relative to a goal or maintained condition.
Watch delay and amplification
Late feedback can produce overcorrection. Strong feedback can make a system oscillate. Timing and gain often explain behavior better than a list of components.
Include the observer
Measurements shape what a system can notice and what operators can decide. A cybernetic description should make that observation boundary explicit.