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

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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 form 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.

Original languageEnglish (US)
Pages (from-to)780-789
Number of pages10
JournalInternational Journal of Medical Informatics
Issue number11-12
StatePublished - Nov 2007


  • Informatics
  • Information storage and retrieval
  • Unified Medical Language System

ASJC Scopus subject areas

  • Health Informatics


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