Which of the following research methods focuses on gathering feedback from experts?

The Delphi method is designed specifically to gather insights and feedback from a panel of experts in a particular field. This research technique involves multiple rounds of questioning where experts provide their opinions and judgments on a topic, and the responses are then summarized and shared with the group for further reflection. This iterative process helps to refine answers and encourages consensus among the experts. The anonymity of the responses also helps to eliminate bias in the results, making it a valuable tool for making informed decisions based on expert knowledge.

Other methods listed, such as internet surveys and interviews, may involve collecting opinions or data from broader audiences without the specific emphasis on expert feedback. Observation typically involves watching behaviors or processes but does not actively seek expert input. Hence, the distinct focus of the Delphi method on leveraging expert opinions makes it the correct choice in this context.