'调研' (diàoyán) is a compound verb meaning 'to conduct research and investigation.' The first character 调 (diào) means 'to investigate' or 'to survey,' often implying systematic data collection, while 研 (yán) means 'to study' or 'to research,' emphasizing analysis and understanding. Together, they convey a formal, purposeful process of gathering and examining information—commonly used in academic, governmental, business, and public health contexts.

This word is typically used as a transitive verb followed by an object (e.g., 调研市场, 调研疫情), or as a noun meaning 'research and investigation' (e.g., 进行调研). It carries a professional, official tone and rarely appears in casual conversation. Unlike general terms like 'study' or 'look into,' 调研 implies structured methodology—such as interviews, questionnaires, or field visits—and is frequently associated with policy-making, market analysis, or public service improvement.