The term due diligence originated from the case law of Britain, France, the United States and China, and was later written into statute law. According to the definition in Blake's legal dictionary, it is: "Generally, due diligence is a conditional caution that a person should maintain when looking for suitable legal requirements or fulfilling obligations during the investigation."
The concept of due diligence can also be traced back to diligence in Roman law, which refers to the cautious attitude that ordinary people should hold when managing affairs, so it should be called due diligence, not net worth investigation.