Subject searching—seeking information with a subject or topic in mind—is often involved in carrying out undergraduate assignments such as term papers and research reports. It is also an important component of information literacy—the abilities and experiences of effectively finding and evaluating, and appropriately using, needed information—which universities hope to cultivate in undergraduates by the time they complete their degree programs. By exploring the subject searching of a small group of upper-level, academically successful undergraduates over a school year I sought to acquire a deeper understanding of the contexts and characteristics of their subject searching, and of the extent to which it was similar in quality to that of search and domain experts. Primary data sources for this study comprised subject searching diaries maintained by participants, and three online subject searches they demonstrated at the beginning, middle, and end of the study during which they talked aloud while I observed, followed by focused interviews. To explore the quality of study participants’ subject searching I looked for indications of advanced thinking in thoughts they spoke aloud during demonstration sessions relating to using strategy, evaluating, and creating personal understanding, which represent three of the most challenging and complex aspects of information literacy. Applying a layered interpretive process, I identified themes within several hundred instances of participants’ advanced thinking relating to these three information literacy elements, with evaluative themes occurring most often. I also noted three factors influencing the extent of similarity between the quality of participants’ advanced thinking and that of search and domain experts which reflected matters that tended to be i) pragmatic or principled, , ii) technical or conceptual, and iii) externally or internally focused. Filtered through these factors, participants’ instances of advanced thinking brought to mind three levels of subject searching abilities: the competent student, the search expert, and the domain expert. Although relatively few in number, I identified at least some advanced thinking evincing domain expert qualities in voiced thoughts of all but one participant, suggesting the gap between higher order thinking abilities of upper-level undergraduates and information literate individuals is not always dauntingly large.

Subject searching—seeking information with a subject or topic in mind—is often involved in carrying out undergraduate assignments such as term papers and research reports. It is also an important component of information literacy—the abilities and experiences of effectively finding and evaluating, and appropriately using, needed information—which universities hope to cultivate in undergraduates by the time they complete their degree programs. By exploring the subject searching of a small group of upper-level, academically successful undergraduates over a school year I sought to acquire a deeper understanding of the contexts and characteristics of their subject searching, and of the extent to which it was similar in quality to that of search and domain experts. Primary data sources for this study comprised subject searching diaries maintained by participants, and three online subject searches they demonstrated at the beginning, middle, and end of the study during which they talked aloud while I observed, followed by focused interviews. To explore the quality of study participants’ subject searching I looked for indications of advanced thinking in thoughts they spoke aloud during demonstration sessions relating to using strategy, evaluating, and creating personal understanding, which represent three of the most challenging and complex aspects of information literacy. Applying a layered interpretive process, I identified themes within several hundred instances of participants’ advanced thinking relating to these three information literacy elements, with evaluative themes occurring most often. I also noted three factors influencing the extent of similarity between the quality of participants’ advanced thinking and that of search and domain experts which reflected matters that tended to be i) pragmatic or principled, , ii) technical or conceptual, and iii) externally or internally focused. Filtered through these factors, participants’ instances of advanced thinking brought to mind three levels of subject searching abilities: the competent student, the search expert, and the domain expert. Although relatively few in number, I identified at least some advanced thinking evincing domain expert qualities in voiced thoughts of all but one participant, suggesting the gap between higher order thinking abilities of upper-level undergraduates and information literate individuals is not always dauntingly large.

It is widely recognised that meaning and interpretation are fundamental aspects of user-system interaction in the retrieval of specialised information. Important constituents of information retrieval system are thesauri. To identify what understandings of thesauri exist, is crucial to improve instruction of database users and for an assessment of the functioning of thesauri in specialised information. Thesauri as phenomena can be viewed from a techno scientific perspective and a lifeworld perspective. The lifeworld perspective is made up of the collective understanding of those who use them. Lifeworld aspects of thesauri, i.e., how they are understood by social science researchers, have been disclosed by applying phenomenographic research against the background of the hermeneutical constitution of the online dialogue. The phenomenographic interpretative model has been used since its knowledge interest focuses on how techno scientific concepts are conceived of in the lifeworld. This has rendered descriptions of conceptions of thesauri in the form of two main categories: 1) the thesaurus as being separable from the database with the subcategories a) the thesaurus as a control device, and b) as incomplete terminology; 2) the thesaurus as being inseparable from the database with the subcategories of a) descriptors as evaluation criteria, and b) as search enhancers. Based on the configuration of the online dialogue, searching without understanding the thesaurus has also been described in the form of a third, 'empty' category and contrasted with the conceptions of thesauri. The findings represent a contribution to the hermeneutics of the online dialogue, and the results are immediately applicable for the development of discourses in the instruction of end-users and future information professionals. They also provide an empirical argument in support of further conceptual development of thesauri, which strives to make explicit the meaning of descriptors by incorporating terminological and epistemological knowledge, thus integrating domain knowledge into the database search process. The work contained in this thesis has not been previously submitted for a degree or diploma at any other higher education institution. To the best of my knowledge and belief, the thesis contains no material previously published or written by another person except where due reference is made.