大纲 (dà gāng) is a broad outline or framework, often used for a course syllabus, project plan, or story structure. It is more general than 提纲 (tí gāng), which is a detailed list of main points for a speech or article, and 纲要 (gāng yào), which highlights essential points or a summary. Use 大纲 when referring to an overall structure or plan.