What method of materials gathering should the writer use for a topic he knows well?

For a topic the writer already knows well, the primary method of materials gathering should be reflection and recall. This involves:

* Brainstorming: Freewriting, mind-mapping, or listing everything the writer already knows about the topic.

* Memory retrieval: Actively trying to remember specific details, examples, anecdotes, and arguments related to the topic. This might involve revisiting personal experiences, past research, or conversations.

* Reviewing personal notes and files: If the writer has previously written or researched the topic, reviewing existing notes, drafts, or relevant documents can significantly streamline the process.

While additional research might be beneficial to add depth or verify information, the core material should come from the writer's existing expertise to ensure authenticity and a strong, personal voice. This approach is efficient and allows the writer to leverage their pre-existing knowledge base.