What is a key aspect of control allocation?

• A. Controls are designated as system-specific, hybrid, or common controls.
• B. Controls are allocated to the specific system elements (i.e., machine, physical, or human elements).
• C. Controls are never allocated to human elements.
• D. Controls are implemented before allocation.

Answer: (B)

Control allocation is about deciding where in the system the control actions actually reside and are executed. The essential idea is to assign those control actions to the available system elements—machines, physical components, or human operators—based on what each element can reliably do, how quickly it can respond, and how its behavior affects overall performance and safety. That’s why the statement about allocating controls to specific system elements is the best fit. Classifying controls by categories like system-specific, hybrid, or common describes types of controls, not where they’re carried out. It’s also not true that controls can never involve human elements—humans often participate in control, especially in supervisory or override roles. And controls aren’t implemented before allocation; the allocation step guides how and where to implement the controls.