%0 Journal Article %A Hilton, Denis %A Villejoubert, Gaëlle %A Bonnefon, Jean-François %T How to do things with logical expressions: Creating collective value through co-ordinated reasoning %D 2005 %J Interaction Studies %V 6 %N 1 %P 103-117 %@ 1572-0373 %R https://doi.org/10.1075/is.6.1.08hil %K conditionals %K quantifiers %K conversation %K probability %K logic %I John Benjamins %X We argue that logical expressions in human language enable speakers to perform particular acts as well as stating propositions which may be true or false. We present a conversational action planning model of co-ordinated reasoning, which we use to predict choice of logical expressions in situations in which two people co-operate in the face of risk and uncertainty. We first show how this model predicts preferences for formulations of conditional directives where a principal instructs an agent on how to behave in a hypothetical situation. Second, we show how this model accounts for choices of quantity and probability expressions that express risk, in situations where a professional advises a client on her options. We conclude that the pragmatic signals encoded in human logical vocabulary can facilitate the co-ordination of social interaction through aiding mutual recognition of intentions on joint projects where collaboration is likely to create value. %U https://www.jbe-platform.com/content/journals/10.1075/is.6.1.08hil