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Item-selecting method of maximum information is widely used in CAT. But it inclines to select the item of high differentiation, hence brings about high percentage of exposure and low percentage for using item base. A-stratification method can overcome this, but it has its faults. The paper introduces two modified item-selecting methods based on a-stratification item-selecting. On the basis of analyzing the two kinds of methods, the paper compares them by monte-karlo simulation experiment.

This paper expounds the design and implementation of an exam system. The design of exam system is based on the theory of the CAT. Its management end and the client are implemented through the WPF technology, using c + + programming language to implement the exam system server. The database is MySQL server and SQLite embedded database, and the Protocol Buffers is format and implementation of the data interaction between server and the client of the exam system. For a united data format of the MySQL and SQLite database, the writer used the database modeling tool PowerDesigner to design the database model, and got the CDM, LDM and PDM. Lastly, the exam system based on CAT is implemented and performing well, and the exam system meets the original goal.