What technique can ensure that instructions given are understood correctly?

Asking the listener questions about what you said is an effective technique for ensuring that instructions are understood correctly because it actively engages the listener in the communication process. This approach encourages them to reflect on the information presented, clarifying their understanding and allowing any misconceptions to be addressed immediately. By soliciting feedback through questions, the speaker can gauge the listener's comprehension and provide further explanations or clarifications as necessary. This interaction not only reinforces the instruction but also fosters a two-way dialogue that can be more effective than passive receipt of information.

The other techniques might also enhance understanding but do not directly involve confirming comprehension with the listener. Providing written instructions can serve as a helpful reference, but it lacks the immediate feedback loop that questions offer. Repeating the instructions can reinforce them, yet without the listener's engagement, there's no guarantee they grasp the content. Using visuals can aid in understanding complex points visually, but it does not address whether the listener can articulate or explain the instructions themselves.