| Computerized Adaptive Test is a new field in the modern testing research. It is of great importance in improving testing efficiency and quality. In the tranditionary test, all the students receive the test by the same batch of questions, irrespective of whether the examine抯 level is high or not, As a result. The examines of low level can抰 answer the quite difficult questions at all, but it leads to anxiety. On the other hand, the examines of high level, those questions with low degree of difficulty can抰 test the students?real level, it may waste energy. CAT solved the problem in accordance with the examine, Which adapts the examine抯 state on its own initiative. The appearance of CAT no only breaks the paper-and-pencil test pattern which carried on from 2000 years ago and changes it into the one by which the computer screen show and the keyboard and mouse can be used to answer the questions, moreover, compared with the traditional. The testing ideas have undertaken tremendous changes. That is ,it sets up a personal test for a examine to reach an accurate measurement. Because the items choosing is to tailor itself to the ability of the test taker, each question that the examine answers all matches their capability. That is to say, the high-ability examine can avoid answering the quite easy questions, but the low-ability one can avoid answering the questions which are beyond his competence from the testing train of though, it抯 not difficult to find out CAT抯 numerous advantages.(1) The testing is efficiency.(2) It抯 more comparative. Because of the specific implementing and scoring ways, CAT抯 final score can be turned into the comparative and explicable measurement. At present, in some developed countries, such as America, CAT has already distinguished itself in the fields of educational test, professional measurement and personnel matters testing, for example, American Graduate Record Examination, Graduate for Management and Administration Entrance Test and the Entire American Nurse National Committee License Test and so on. all of the above ii? / ~#i ~ \IASTER S THESrS adapt CAT way. It抯 not difficult to find out that CAT stands for the developing orientation and in the future education and psychological testing. But in China, the computer software on CAT can be hardly seen, the National College English Band four and six Test committee is getting down to the research in this aspect. But at present there抯 no finished product software model coming out. Therefore, to go deep into the CAT research is of important significance in Chinese testing technology. The first part of this article begins with analyzing the traditional testing problems, and it puts forward the meaning and necessity of CAT, meanwhile, it illustrates the CAT抯 inside and outside developing state. The second part analyses the theoretical basis of CAT. The discussion centers on JRT and the effect of the theory in the testing work, it analyses such difficulty, difference, credibly, efficiency as important concepts in greater detail. The third part raises the design way and implementation course on CAT抯 software model. At the same time, it lists some important arithmetic, including making up arithmetic and sampling tactics and...
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