In recent years the psychology of reasoning has undergone radical change, which can only be seen as a Kuhn-style scientific revolution. This shift has been dubbed New Paradigm . For years, psychologists of reasoning focused on binary truth values and regarded the influence of belief as a bias. In contrast to this, the new paradigm puts probabilities, and subjective degrees of belief, centre stage. It also emphasises subjective psychological value, or utility; the way we reason within our own social environment ( social pragmatics ); and the crucial role of dual process theories. Such...