A United Nations fact-finding mission, also called a United Nations commission of inquiry, is a United Nations mission carried out with the intention to discover facts. They are often sent to troubled areas. Fact-finding missions have been sent by the UN to a number of trouble-spots over the past 50 years, on a pragmatic, occasional, case-by-case basis. There are legal and political parameters for fact-finding, which stresses its value and opens the door for more comprehensive, ongoing use of this tool, particularly by the Secretary-General.