What is the scope of rhetoric? While classical rhetoric trained speakers to be effective_persuaders in public forums and institutions like courtrooms and assemblies, contemporary rhetoric investigates human discourse writ large. Public relations,lobbying,law,marketing professional and technical writing,and advertising are modern professions that employ rhetorical practitioners.What is the scope of rhetoric? While classical rhetoric trained speakers to be effective persuaders in public forums and institutions like courtrooms and assemblies, contemporary rhetoric investigates human discourse writ large. Public relations, lobbying, law, marketing, professional and technical writing, and advertising are modern professions that employ rhetorical practitioners