 Williamson’s initial framing of the debate on the norm of assertion takes for granted a number of assumptions: for instance, that there is a single norm, that it is constitutive of assertion, that all and only assertions are subject to it. In subsequent work, some of these assumptions have been questioned. Here we limit ourselves to list each assumption (ignoring the numerous objections that affect them). The interested reader will find a discussion of the case for and against each assumption in the supplementary document  Which Kind of Norm?.