| Zusammenfassung: |
Abstract: A study about information seeking behaviour of students and staff using OPACs is presented. Based on about 6 million requests sent to the OPAC of the Freiburg University Library system from March to July 2004, this study was created by applying transaction log analysis (TLA). Initially the data acquisition procedure is described. The original web server log was expanded to provide additional fields. Then the log entries were sorted into request types identified by the referrer field. The OPAC usage in the course of an average day was aggregated for a number of user groups. <br><br>In a next step the query structure was explored (e.g. the number of query terms and fields used as well as the usage of operators and truncations). By comparison with a similar TLA effects of the interface layout on the queries could be identified. In the last part of the study another approach based on heuristic session analysis dealt with subsequent queries within a session and the clients navigation within the result sets. The number of queries per session, the number of full titles displayed and the number of short title pages viewed was extracted from the log file
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