The term "multiple independent sources" in journalism, criminal justice, science and general research, are two or more unconnected people, organizations, or objects which provide a given set of information or samples. For example, two separate people who see a traffic accident, at the spot, could be considered independent sources. However, if one person saw the accident and told the other one about it, then they would not be "independent", since one would "depend" on the other for their information. Also, if two witnesses to an event discuss what they saw before they are asked about it and agree to tell the same story, then they are also no longer independent. As another example, two scientific devices could be considered independent sources of measurement data, unless they shared the same wiring or electrical power supply (or similar factors).