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Wu, I.-C.; Vakkari, P.: Effects of subject-oriented visualization tools on search by novices and intermediates (2018)
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- Date
- 9.12.2018 16:22:25
- Source
- Journal of the Association for Information Science and Technology. 69(2018) no.12, S.1428-1445
-
Pennanen, M.; Vakkari, P.: Students' conceptual structure, search process, and outcome while preparing a research proposal : a longitudinal case study (2003)
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- Abstract
- This article focuses an analysing students' information needs in terms of conceptual understanding of the topic they propose to study and its consequences for the search process and outcome. The research subjects were 22 undergraduates of psychology attending a seminar for preparing a research proposal for a small empirical study. They were asked to make searches in the PsycINFO database for their task in the beginning and end of the seminar. A pre- and postsearch interview was conducted in both sessions. The students were asked to think aloud in the sessions. This was recorded, as were the transaction logs. The results show that during the preparation of research proposals different features of the students' conceptual structure were connected to the search success. Students' ability to cover their conceptual construct by query terms was the major feature affecting search success during the whole process. In the beginning also the number of concepts and the proportion of subconcepts in the construct contributed indirectly via search tactics to retrieving partly useful references. Students' ability to extract new query terms from retrieved items improved search results.
- Date
- 19. 6.2003 17:22:33
-
Vakkari, P.; Pennanen, M.; Serola, S.: Changes of search terms and tactics while writing a research proposal : a longitudinal case study (2003)
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- Abstract
- The study analyses how students' growing understanding of the topic and search experience were related to their choice of search tactics and terms while preparing a research proposal for a small empirical study. In addition to that, the findings of the study are used to test Vakkari's (2001) theory of task-based IR. The research subjects were 22 students of psychology attending a seminar for preparing the proposal. They made a search for their task in PsychINFO database at the beginning and end of the seminar. Data were collected in several ways. A pre- and post-search interview was conducted in both sessions. The students were asked to think aloud in the sessions. This was recorded as were the transaction logs. The results show that search experience was slightly related to the change of facets. Although the students' vocabulary of the topic grew generating an increased use of specific terms between the sessions, their use of search tactics and operators remained fairly constant. There was no correlation between the terms and tactics used and the total number of useful references found. By comparing these results with the findings of relevant earlier studies the conclusion was drawn that domain knowledge has an impact on searching assuming that users have a sufficient command of the system used. This implies that the tested theory of task-based IR is valid on condition that the searchers are experienced. It is suggested that the theory should be enriched by including search experience in its scope.
-
Vakkari, P.; Järvelin, K.; Chang, Y.-W.: ¬The association of disciplinary background with the evolution of topics and methods in Library and Information Science research 1995-2015 (2023)
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- Date
- 22. 6.2023 18:15:06
-
Talja, S.; Vakkari, P.; Fry, J.; Wouters, P.: Impact of research cultures on the use of digital library resources (2007)
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- Date
- 2.11.2007 12:12:26
-
Vakkari, P.; Chang, Y.-W.; Järvelin, K.: Disciplinary contributions to research topics and methodology in Library and Information Science : leading to fragmentation? (2022)
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- Date
- 12.11.2022 12:54:41
- Source
- Journal of the Association for Information Science and Technology. 73(2022) no.12, S.1706-1722
-
Vakkari, P.: ¬A theory of the task-based information retrieval process : a summary and generalisation of a longitudinal study (2001)
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- Date
- 7.11.2005 12:37:58
-
Sihvonen, A.; Vakkari, P.: Subject knowledge improves interactive query expansion assisted by a thesaurus (2004)
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- Date
- 27. 8.2017 12:44:31
-
Vakkari, P.: How specific thesauri and a general thesaurus cover lay persons' vocabularies concerning health, nutrition and social services
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- Series
- Advances in knowledge organization; vol.12
-
Tuomaala, O.; Järvelin, K.; Vakkari, P.: Evolution of library and information science, 1965-2005 : content analysis of journal articles (2014)
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- Date
- 17. 6.2014 12:35:37
-
Vakkari, P.; Völske, M.; Potthast, M.; Hagen, M.; Stein, B.: Modeling the usefulness of search results as measured by information use (2019)
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- Abstract
- The documents retrieved by a web search are useful if the information they contain contributes to some task or information need. To measure search result utility, studies have typically focused on perceived usefulness rather than on actual information use. We investigate the actual usefulness of search results-as indicated by their use as sources in an extensive writing task-and the factors that make a writer successful at retrieving useful sources. Our data comprise 150 essays written by 12 writers whose querying, clicking and writing activities were recorded. By tracking authors' text reuse behavior, we quantify the search results' contribution to the task more accurately than before. We model the overall utility of the search results retrieved throughout the writing process using path analysis, and compare a binary utility model (Reuse Events) to one that quantifies a degree of utility (Reuse Amount). The Reuse Events model has greater explanatory power (63% vs. 48%); in both models, the number of clicks is by far the strongest predictor of useful results-with ß-coefficients up to 0.7-while dwell time has a negative effect (ß between -0.14 and -0.21). As a conclusion, we propose a new measure of search result usefulness based on a source's contribution to an evolving text. Our findings are valid for tasks where text reuse is allowed, but also have implications on designing indicators of search result usefulness for general writing tasks.
-
Vakkari, P.; Järvelin, K.: Explanation in information seeking and retrieval (2005)
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- Date
- 19. 1.2007 12:57:33
