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What Do Exploratory Searchers Look at in a Faceted Search Interface?. Bill Kules and Matthew Banta The Catholic University of America School of Library and Information Science. Outline. 60-second demo Our goals Research questions Experimental design Results Future work. Our Goals.

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what do exploratory searchers look at in a faceted search interface

What Do Exploratory Searchers Look at in a Faceted Search Interface?

Bill Kules and Matthew Banta

The Catholic University of AmericaSchool of Library and Information Science

outline
Outline
  • 60-second demo
  • Our goals
  • Research questions
  • Experimental design
  • Results
  • Future work
our goals
Our Goals
  • Improve understanding of how faceted interfaces affect searcher actions and tactics
  • Develop and validate a methodology for creating exploratory search tasks for evaluations of search systems
research questions
Research Questions
  • How long do searchers look at the major elements (facets, results, query box, breadcrumbs, etc.) of the interface?
  • In what order do searchers look at the major elements in a faceted search interface?
experimental design
Experimental Design
  • N=18 successful sessions
    • From 21 subjects recruited
  • 1x2 within-subjects design
  • Task types
    • Exploratory tasks (n=4)
    • Known item tasks (n=2)
  • Counterbalanced within task type
procedure
Procedure
  • Introduction
  • 90 second training video
  • Calibrate eye tracker
  • Conduct 6 searches
  • Questionnaire after each search
  • Retrospective verbal report
    • Video of two searches with gaze data overlaid
  • Final questionnaire
six tasks
Six Tasks
  • Exploratory
    • Feminism in the United States
    • Textile industry on three continents
    • Great Britain and the colonies in the 20th century
    • History of the Olympic games
  • Known item: find a book
    • Firefly Encyclopedia of Trees
    • Harry Potter and the Goblet of Fire
exploratory task
Exploratory Task

Imagine you are taking a class called “Feminism in the United States”. For this class you need to write a research paper on some aspect of the U.S. feminist movement, but have yet to decide on a topic. Use the catalog to find two possible topics for your paper. Then use the catalog to find three books for each topic so that you might make a decision as to which topic to write about.

equipment configuration
Equipment Configuration
  • NCSU Catalog Research Testbed
  • Tobii 2150 remote eye tracker
    • 21” monitor
    • 50 Hz sampling rate
    • Resolution 1024x768
  • Tobii Clearview v2.7.1
  • Gaze fixations
    • Minimum 100 ms
    • 30 pixel radius
  • Manually segmented AOIs
slide11

Interface with Areas of Interest (AOIs)

Query

Breadcrumbs

Facets

Results

slide13

Exploratory Search Tasks

Known ItemSearch Tasks

slide17

Interface with Areas of Interest (AOIs)

Query

Breadcrumbs

Facets

Results

post search interviews
Post-search Interviews
  • “The subject thing worked. I don’t normally do subject searches.”
  • “I needed a subject and I didn’t want to look through 2000 books.”
  • “shopping around” - selecting facets and then looking to see what was available for a particular subject
limitations
Limitations
  • Training was provided
  • Researcher-provided tasks in lab setting
  • One high-level scenario
  • Tasks constructed were focused on this study
future work
Future Work
  • Additional factors
    • Training – Next study supported by OCLC/ALISE grant and CUA purchase of an eye tracker
    • Number and size of facets
    • Domain, search knowledge
  • Additional measures
    • Gaze behavior – e.g. fixation counts
    • “Traditional” measures – e.g. clicks
  • Refine procedure for exploratory search task generation
conclusions
Conclusions
  • Facets played a major role in exploratory searches
    • Fixation time about ½ as much as on results
    • On first page about equal
    • Facet-result & result-breadcrumb ~ ½ of all transitions
acknowledgements
Acknowledgements
  • Rob Capra, Tito Sierra, Jason Casden, and Joe Ryan
  • Doug Oard and members of the UMD HCIL – for the use of their facilities and eye-tracker
  • This research was supported by a grant from Catholic University and in part by a grant from the NSF/Library of Congress (IIS 0455970).