Astington (1988) found that seven- to nine-year-olds often fail to distinguish between promises and predictions when judging the utterances of characters in simple stories. Instead, these children attend only to the outcome of the story (i.e. whether the promised event occurred) when deciding whether a promise has been made and, to a lesser extent, when deciding whether the speaker is responsible for the outcome. The purpose of the present study was to examine whether seven- to nine-year-olds (a) vary their judgements of responsibility according to the reason that the promised action was not completed, and (b) recognize that an unfulfilled promise is a promise regardless of whether the speaker's failure is unavoidable or intentional. Seven-year-olds, nine-year-olds, and adults were asked to make promise and responsibility judgements for two story types: stories in which the promiser intentionally failed to fulfil his or her promise and stories in which an unforeseen event prevented the promiser from fulfilling the promise. Participants at all ages assigned responsibility correctly across both story types. In making promise judgements, however, the seven-year-olds' decisions about promises reflected a misguided attention to the outcome of a promise or the obstacle to its fulfilment. The nine-year-olds recognized that an unfulfilled promise is a promise but only when there was a clear reason for the speaker's failure to fulfil his or her obligation. We suggest that children consider only sincere promises to be instances of promising and make inferences about speaker sincerity by looking to external factors in the communicative context.