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The study participants were asked to perform two searches, one on the Web and the other in a web\u2010based library system. Perceived search difficulty and mental effort for searching on the two types of systems were compared through participant self\u2010reports, dual\u2010task performance, and search log analysis. After the searches were completed, the subjects reported that library searching was more difficult to conduct and they had to concentrate more than when Web searching. However, the results of dual\u2010task performance do not reveal much difference in mental effort or concentration during searches in the two systems. Rather, they invested mental effort differently when viewing search results and reading retrieved documents. The findings indicate that a dual\u2010task method provides a useful technique to measure mental effort in online searching, and it has a great potential to be used to measure other aspects of information retrieval such as task complexity and multitasking information behavior.<\/jats:p>","DOI":"10.1002\/meet.14504201155","type":"journal-article","created":{"date-parts":[[2006,10,18]],"date-time":"2006-10-18T10:09:54Z","timestamp":1161166194000},"source":"Crossref","is-referenced-by-count":17,"title":["Dual\u2010task performance as a measure of mental effort in searching a library system and the Web"],"prefix":"10.1002","volume":"42","author":[{"given":"Yong\u2010Mi","family":"Kim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soo Young","family":"Rieh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,10,18]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-4571(199607)47:7<493::AID-ASI3>3.0.CO;2-P"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1080\/01638538609544653"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1027\/\/1618-3169.49.2.109"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02297356"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/1097-4571(2000)9999:9999<::AID-ASI1547>3.0.CO;2-E"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/asi.10015"},{"key":"e_1_2_10_8_1","doi-asserted-by":"crossref","DOI":"10.1108\/S1876-0562(1994)94B","volume-title":"Using subject headings for online retrieval","author":"Drabenstott K. 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