An end user evaluation of query formulation and results review tools in three medical meta-search engines

Gondy Leroy, Jennifer Xu, Wingyan Chung, Shauna Eggers, Hsinchun Chen
2007 International Journal of Medical Informatics  
Purpose: Retrieving sufficient relevant information online is difficult for many people because they use too few keywords to search and search engines do not provide many support tools. To further complicate the search, users often ignore support tools when available. Our goal is to evaluate in a realistic setting when users use support tools and how they perceive these tools. Methods: We compared three medical search engines with support tools that require more or less effort from users to
more » ... a query and evaluate results. We carried out an end user study with 23 users who were asked to find information, i.e., subtopics and supporting abstracts, for a given theme. We used a balanced within-subjects design and report on the effectiveness, efficiency and usability of the support tools from the end user perspective. Conclusions: We found significant differences in efficiency but did not find significant differences in effectiveness between the three search engines. Dynamic user support tools requiring less effort led to higher efficiency. Fewer searches were needed and more documents were found per search when both query reformulation and result review tools dynamically adjust to the user query. The query reformulation tool that provided a long list of keywords, dynamically adjusted to the user query, was used most often and led to more subtopics. As hypothesized, the dynamic result review tools were used more often and led to more subtopics than static ones. These results were corroborated by the usability questionnaires, which showed that support tools that dynamically optimize output were preferred. (G. Leroy). sure precision and recall with laboratory experiments. For example, Baujard et al. [1] evaluated their multi-agent retrieval software in terms of precision and recall of web pages for pre-specified medical queries. Bin and Lun [2] compared the retrieval effectiveness of eight medical online search engines with single keyword and question-answering tasks. For an historic overview of the usage of laboratory studies, we refer to 1386-5056/$ -see front matter
doi:10.1016/j.ijmedinf.2006.08.001 pmid:16996298 fatcat:txn5cptncrbvzaltb47cbs2rwq