摘要: During the past several years, the senior investigator has been attempting to develop a unified theory of human reasoning. This research has proceeded along two major fronts, one involving the formulation of a subtheory of inducti... 展开 During the past several years, the senior investigator has been attempting to develop a unified theory of human reasoning. This research has proceeded along two major fronts, one involving the formulation of a subtheory of inductive reasoning, the other involving the formulation of a subtheory of deductive reasoning. This article discusses work done on deduction. Although the theory of deductive reasoning is not yet completely formulated or tested, work on the theory is far enough along to merit a progress report. So far, models of deduction for the three main kinds of syllogisms that have been investigated by students of human reasoning have been formulated and tested: categorical, conditional, and linear syllogisms. The theory and data for each of the three kinds of syllogisms are summarized and some conclusions are drawn. 收起