This document discusses different types of supporting material that can be used in a speech to strengthen arguments and ideas. It identifies facts, statistics, definitions, descriptions, explanations, examples, testimonies, analogies as common types of supporting evidence. It also outlines potential sources for supporting material, including personal experience, research interviews, surveys, library resources, government documents, academic journals, and internet documents. Finally, it stresses the importance of conducting ethical research by ensuring evidence is relevant, credible, current, and properly cited.