 In addition to these three factors (and remembering the cautionary, third point made earlier distinguishing propositions of law from propositions about law), there are theories about what causation does or should mean in law. Such theories have been proposed by legal theorists as they utter propositions about law. Such theories, despite their non-authoritative source, have played a major role in the history of thought about the nature of causation in the law. Some of such theories, to the extent their content accurately mirrors propositions of law, have even become part of the law of which they are theories (Raz 2012).