Research And Design Of Computerized Adaptive Testing System Based On.NET

Exam is one of the most important links in teaching activity, now, with theincreasing maturity of the development of computer technology and network technology,many kinds of network examination system are emerging. Most of the test systems arebased on the classical test theory (CTT) currently. Therefore, some problems exist suchas tester’s knowledge and ability levels cannot be tested objectively and accurately andso on.This thesis introduces us the basic knowledge and limitations of classical testtheory, and also it describes the basic concept of item response theory, three models ofIRT and their characteristic curves, the information function and the ability of parameterestimation in detail. On this basis, the Computerized Adaptive Testing (CAT) model isput forward with the combination of the rapid development of computer networktechnology. The system is in Windows XP, choosing ASP.NET(C#)、SQL Server2005for developing online examination system. It is safer because of the use of B/S structure,so clients don’t have to install any user applications. The UML is used to analyze thesystem structure and introduce the design of each function module in it. The selectionstrategy by differentiation is improved and the rate of item exposure is effectivelycontrolled. Meanwhile, it carries out a statistical analysis of test data obtained from thesystem operation.The system can randomly select the item according to the different ability ofsubjects, thus it reduces the test length, and compared with traditional onlineexamination system, it improves the efficiency of tests. finally, it makes a summary toadaptive testing system and look into the distance for direction of developing andresearching in adaptive testing system.