Which of the following methods involves asking yourself a series of general and subject-specific questions in order to generate speech topics?

The method of asking oneself a series of general and subject-specific questions to generate speech topics is known as Topoi. This concept originates from classical rhetoric and refers to a set of topics or guiding questions that can help speakers explore various angles of a subject. By utilizing Topoi, speakers can delve deeper into their ideas by considering factors such as who their audience is, the purpose of their speech, relevant contexts, and potential arguments or examples to support their points. This systematic approach aids in brainstorming and developing a rich array of speech topics, thus facilitating the creation of more engaging and relevant content.

The other methods mentioned, while useful in different contexts, do not specifically revolve around the practice of questioning to uncover topics for speeches. A dictionary of topics typically provides pre-defined subjects without the probing inquiry that Topoi promotes. Similarly, a search directory is geared towards helping individuals find existing information, rather than aiding in the creative generation of topics through self-questioning. A tree diagram is a visual representation that shows relationships between ideas or categories but does not inherently involve the process of questioning oneself to elicit topic ideas.