  From the above rather small list of sophisms, it can already be noticed that some sentences are more complex, and thus more logically puzzling, than others. Some sentences do not seem puzzling in themselves at all, but become puzzling only within a certain “context” that is set up within which arguments proving and disproving the sophism must be developed. Such a context was called a   “casus”.[7]  It seems likely that the proving and disproving of the sophism sentence was done along the lines of a medieval oral “disputatio” within the classroom setting. This is the way Richard writes up his summaries: Proposal of the sophism, sometimes within a casus; arguments establishing the truth of the sentence; arguments establishing the falsity of the sentence; resolution of the sophism along with identification of the sophistical fallacy involved.