For more information on this type of reasoning see casuistry.
These are followed in experimental design. They were codified by Francis Bacon, and developed further by John Stuart 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.
In law, corroboration refers to the requirement in some jurisdictions, such as Scotland, that any evidence adduced be backed up by at least one other source.
Plutchik, Robert (1983) Foundations of Experimental Research Harper's Experimental Psychology Series.