Query Previews in Networked Information systems

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Query Previews in Networked Information systems

• K.Doan, C.Plaisant, B.Shneiderman
• Department of Computer Science
• University of Maryland, College park

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Advantages of Dynamic Queries

• Visual representation of the Querys components
• Visual representation of the results
• Rapid, incremental and reversible control of the
  query
• Selection by pointing, not typing
• Immediate continuous feedback

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Problems in a querying Process

• Network Performance
• Data Volume
• Data Complexity

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The Two- Phase Approach

• Query Previews
• - formulation of an initial query
• Query Refinement Phase
• - furthur refinement of the datasets

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Query Preview Phase

• Users formulate an initial query by selecting
  desired attribute values
• The matching datasets are shown on preview bars
• Undesired datasets are eliminated
• Focus on a manageable number of data sets

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Initial Display of Query preview Panel
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Query preview panel after attribute selection
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Query Refinement Phase

• Input-The datasets from the Query Preview phase
• The datasets are furthur refined and returned in
  this phase

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Query refinement Panel

• Search Results Links to Faculty Pages
• Ben_Shneiderman Professor, HCI

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HCI Metrics

• Ease of Use Navigation
• Good First Impression
• High User Retention over Time
• High Learnability
• Lesser number of user errors

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Special Features of Query previews

• Can focus on a manageable number of datasets
• Improves Network performance
• Can handle large amounts of data
• Multiple attributes are simultaneously handled
  with convenience

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Comparison with the other Methods

• Can handle many attributes with ease and without
  confusion
• (unlike parallel coordinates)
• No playing with the axes is required as in star
  coordinates
• Very easy and fast to use for first time users

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THANKS!