  We perform a speech act, then, when we overtly commit ourselves in a certain way to a content—where that way is an aspect of how we speaker-mean that content. One way to do that is to invoke a convention for undertaking commitment; another way is overtly to manifest one’s intention to be so committed. We may elucidate the relevant forms of commitment by spelling out the norms underlying them. We have already adumbrated such an approach in our discussion of the differences among asserting and conjecturing. Developing that discussion a bit further, compare 