Abstract: Several theoretical models of inductive reasoning had been introduced and assessed. There were two kinds of models of inductive reasoning. The first kind of category-based models was based on the similarity. This kind of models can explain the inductive reasoning phenomena in people’s knowledge poor domains well. The second kind of models emphasized on the function of the people’s knowledge and experience. This kind of models can explain the inductive reasoning phenomena in people’s knowledge rich domains well. Several questions of these models were supposed.

Key words: inductive reasoning, models, introduce, assess, similarity, knowledge