Which of the following best describes a 'directive'?

A 'directive' is best described as an oral order from a commander for action because it directly communicates the intent and expectations of the commander to subordinates in a clear and authoritative manner. This form of command is crucial in military contexts, where timely and decisive instructions are necessary to ensure effective execution of tasks and missions.

In this context, directives play an essential role in maintaining order and ensuring that everyone understands their responsibilities. The oral nature of the order allows for immediate clarification and adjustment, enhancing the responsiveness of the unit.

Other options present concepts that are related but do not embody the specific characteristics of a directive. For instance, a written order for performance evaluation is more formal and focuses on assessment rather than immediate action. Outlining procedures for a drill refers to instructional content rather than a direct directive for action and is typically more detailed and instructional in nature. Lastly, a command given to start a formation is specific to the initial action rather than encompassing the broader definition of what a directive entails, which can apply to various situations beyond just starting a formation.