The Study of Item Selection Method in CAT

Item selection method is one of the most important parts of computerized adaptive testing. Traditional method is based on the item information function to select the item which has maximum information, with the maximum information test to achieve the purpose of accurate estimates the examinee’s ability level. However, this method has high item exposure rate and the test content imbalance problem, etc. To solve these problems, this article introduces a new heuristic item selection method. The results of the study show that compared with the maximum information method, with the assurance of the condition of the same measurement accuracy, the new method can better control item exposure rate and achieve content balancing.