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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.<\/jats:p>","DOI":"10.4018\/ijopcd.2017100101","type":"journal-article","created":{"date-parts":[[2017,8,3]],"date-time":"2017-08-03T10:05:58Z","timestamp":1501754758000},"page":"1-23","source":"Crossref","is-referenced-by-count":0,"title":["A Test Sheet Optimization Approach to Supporting Web-based Learning Diagnosis Using Group Testing Methods"],"prefix":"10.4018","volume":"7","author":[{"given":"Chu-Fu","family":"Wang","sequence":"first","affiliation":[{"name":"National Pingtung University, Department of Computer Science, Pingtung, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chih-Lung","family":"Lin","sequence":"additional","affiliation":[{"name":"National Pingtung University, Department of Computer Science, Pingtung, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gwo-Jen","family":"Hwang","sequence":"additional","affiliation":[{"name":"National Taiwan University of Science and Technology, Graduate Institute of Digital Learning and Education, Taipei City, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheng-Pin","family":"Kung","sequence":"additional","affiliation":[{"name":"National Pingtung University, Department of Computer Science, Pingtung, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shin-Feng","family":"Chen","sequence":"additional","affiliation":[{"name":"National Pingtung University, Department of Education, Pingtung, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2432","reference":[{"key":"IJOPCD.2017100101-0","author":"E.Aarts","year":"1997","journal-title":"Local Search in Combinatorial Optimization"},{"key":"IJOPCD.2017100101-1","doi-asserted-by":"publisher","DOI":"10.1027\/1614-2241.3.1.14"},{"key":"IJOPCD.2017100101-2","unstructured":"Bilder, C. 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