If writing for a technical or academic audience, clearly define the "state" of the system you are discussing and the "actuation mechanism" (how you exert influence).
Reiterate that control is a spectrum ranging from technical precision to emotional regulation. We Control
Argue that the more we try to control external variables, the more we realize how many "disturbance inputs" (unpredictable events) actually exist. III. The Internal Reality: Self-Control If writing for a technical or academic audience,