Under the "clearly erroneous" standard, where a trial court (as opposed to a jury or administrative agency) makes a finding of fact, such as in a bench trial, that finding will not be disturbed unless the appellate court is left with a "definite and firm conviction that a mistake has been committed" by that court. For example, if a court finds, based on the testimony of a single eyewitness, that a defendant broke a window by throwing a 30-pound rock over 100 feet, the appeals court might reverse that factual finding based on uncontradicted expert testimony (also presented to the lower court) stating that such a feat is impossible for most people. In such a case, the appeals court might find that, although there was evidence to support the lower court's finding, the evidence taken as a whole—including the eyewitness and the expert testimony—leaves the appellate court with a definite and firm conviction that a mistake was committed by the Court below.