Abstract: Derived from a combination of cognitive psychology and psychometrics, Cognitive Diagnosis Theory utilizes modern statistical methods and computer technology to determine subjects’ cognitive structures and processes. There are many cognitive diagnosis models, and each has distinct characteristics and application conditions. Selection of the models a are crucial to the outcome of cognitive diagnosis. This article discusses the development course, traits and merits of various cognitive diagnosis models, which will help researchers in making better decision at choosing specific model.

Key words: cognitive diagnosis, cognitive diagnosis models, methods