A Test Sheet Optimization Approach to Supporting Web-based Learning Diagnosis Using Group Testing Methods

Chu-Fu Wang, Chih-Lung Lin, Gwo-Jen Hwang, Sheng-Pin Kung and Shin-Feng Chen
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Chu-Fu Wang: National Pingtung University, Department of Computer Science, Pingtung, Taiwan
Chih-Lung Lin: National Pingtung University, Department of Computer Science, Pingtung, Taiwan
Gwo-Jen Hwang: National Taiwan University of Science and Technology, Graduate Institute of Digital Learning and Education, Taipei City, Taiwan
Sheng-Pin Kung: National Pingtung University, Department of Computer Science, Pingtung, Taiwan
Shin-Feng Chen: National Pingtung University, Department of Education, Pingtung, Taiwan

International Journal of Online Pedagogy and Course Design (IJOPCD), 2017, vol. 7, issue 4, 1-23

Abstract: Assessment can help teachers to examine the effectiveness of teaching and to diagnose the unfamiliar basic concepts (or attributes) of students within the testing scope. A web-based adaptive testing and diagnostic system can achieve the above objective efficiently and correctly. From a diagnostic point of view, the major concerns are to diagnose whether or not an examinee has learned each basic concept well in the testing scope, while also limiting the number of test items used (the testing length) to as few as possible, which will be directly related to the patience of the examinee. In this paper, we consider a test item selecting optimization diagnostic problem to reveal the mastery profile of an examinee (that is, to diagnose each basic concept's learning status (well learned/unfamiliar) in the testing scope) with a short testing length and a limited test item exposure rate. This paper uses the techniques of Group Testing theory for the design of our test item selecting algorithm. Two test item selecting strategies, the bisecting method and the doubling method, are proposed. The effectiveness of the proposed methods was evaluated by experimental simulations. The results show that both of the proposed algorithms use fewer test items and a limited test item exposure rate compared to the conventional methods.

Date: 2017
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