Unterstützung beim Finden und Durchführen von Suchstrategien in Digitalen Bibliotheken

End users of modern information systems often lack the necessary strategic or procedural search knowledge. This missing search expertise leads to the use of ineffectiv or inefficient search tactics and strategies. Based on this problem, this thesis examines different methods to support inexperienced users of a search system in building and executing search strategies for their information problem. Searching is seen as a problem solving process. At the beginning is a search task as the information problem, that the user needs to identify and comprehend. Important aspects of this process are (a) dividing the problem in subproblems or subtasks, and (b) choosing appropriate search tactics based on the specifics of a concrete situation during a search. For this reason the thesis describes search situations based on system and user parameters, and provides a simple classification for such situations. Most of the research uses the Daffodil digital library search system. A number of implemented extension of the system for supporting the user in planning and executing search strategies are described in this work. Based on the parametrised description of search situations and using well-known tactics, which have been implemented for Daffodil, a recommendation or suggestion system for search tactics, stratagems and strategies is described. It uses the technique of