For more information on this type of reasoning see casuistry.
Another type of corroborating evidence comes from using the Baconian method,i.e. the method of agreement, method of differences, and method of concomitant variation.
These are followed in experimental design. They were codified by Francis Bacon, and developed further by J.S. Mill and consist of controlling several variables in turn to establish which variables are causally connected. These principles are widely used intuitively in various kinds of proofs, demonstrations and investigations, in addition to being fundamental to experimental design.
See also: Judgment