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CONCLUSION PRS theory was originally supported by a variety of evidence, largely based on content effects observed in Wason’s selection task. This evidence included the finding of facilitation for reasoning about abstract regulations, devoid of concrete or familiar content (Cheng & Holyoak, 1985, Experiment 2). Although the interpretation of these results was subsequently challenged, more recent research has confirmed both tha t facilitation of reasoning with abstract deontic rules is a robust phenomenon, and tha t PRS theory provides the most complete account of the factors tha t determine when such facilitation is obtained. In particular, a violation-checking context provides a major cue to interpret the stated rule as a regulation, and explicit negatives describing cases facilitate matching