It is proposed that reasoning about social contracts, such as conditional promises and warnings, is under the control of a compound schema made of two pragmatic schemas (Cheng & Holyoak, 1985), expressing an obligation and a permission. Two experiments were run using thematic versions of the Wason selection task in which the rule and the core of the scenario were kept constant and the point of view of the actor (e.g. promisor or promisee) was varied. The results supported the predictions (including the occurrence of a correct pattern of response that consists of all four cards) and falsified predictions derived from Cosmides' (1989) theory of social exchange. The mental models theory and Evans' two-stage theory of reasoning are also discussed in the light of the present results.
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