As usual, the Proceedings of the International Colloquium on Cognitive Science include leading-edge work by outstanding researchers in the field. This volume contains three kinds of papers corresponding to three of the main disciplines in cognitive science: philosophy, psychology, and artificial intelligence. The title - Cognition, Agency and Rationality - captures the main issues addressed by the papers. Of course, all are concerned with cognition, but some are especially centred on the very concept of rationality, while others focus on (multiple) agency. The diversity of their...

A speech for the defence in a Paris murder trial, a road-safety slogan, Hobbes' political theory; each appeals to reason of a kind, but it remains an oblique and rhetoricalldnd. Each relies on comparisons rather than on direct statements, and none can override or supersede the conclusions of ethical reasoning proper. Nevertheless, just as slogans may do more for road safety than the mere recital of accident statistics, or of the evidence given at coroners' inquests, so the arguments of a Hobbes or a Bentham may be of greater practical effect than the assertion of genuinely ethical or...