• Roger Bararunyeretse
Speciale, Kandidatuddannelsen
The role of IIR systems, i.e., DLs. is to provide services that support users to perform work tasks that involve interaction behavior. Components of such services include users, the presented content as well as the system on which they are performed. The purpose of this study was to evaluate the usability and usefulness of an IIR system by investigating the role played by domain knowledge in users’ interactions with the system and the system content. Two classes of subjects were recruited from two different areas of expertise in order to participate in an experimental session on the system. Subjects’ information searching behaviors were observed and both objective and subjective measures were utilized. Objective measures were concerned with the number of search steps/tactics, the number of search terms issued by subjects while completing nine predefined tasks, the amount of tasks completion time, as well as the task completeness; whereas subjective measures were based on questionnaires that included some rating statements which elicited the perceived subjects’ level of satisfaction. Similarities/differences between the two classes were also observed and analyzed through documents relevance judgments, criteria for relevancy as well as system documents presentation order. Results of the study revealed that domain knowledge and IR knowledge complement each other in order to perform search tasks. In addition, variables such as satisfaction consisting of system navigation, system ease of use as well as the accuracy of system content are important criteria for usability and usefulness evaluations of an IIR system.
Udgivelsesdato1 jul. 2011
Antal sider99
Udgivende institutionThe Royal School of Library & Information Science / Det Informationsvidenskabelige Akademi, København-Danmark


  • Digital libraries, Evaluation, Human - computer interaction, Information behavior, Information retrieval, Interactive information retrieval, Information seeking, Information systems, Usability, Usefulness