The source type depends on whether the project seeks a personal story, a fact, an answer to a question, or evidence for a theory. Personal accounts and private papers often sit in specialist archives or libraries, while national facts may lead to government collections such as The National Archives. A narrow question can support a focused inquiry, but testing a theory calls for a wider evidential net. That distinction sets both the likely repositories and the scale of research.
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Choose evidence for a story, fact, question, or theory
A search for personal stories needs different collections from a factual inquiry, while testing a theory requires a wider net.