Cheops: A Compact Explorer for Complex Hierarchies - PowerPoint PPT Presentation

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Cheops: A Compact Explorer for Complex Hierarchies

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Crim's Hierarchical Engine for OPen Search. I think they're ... graphically represent the Dewey Decimal System? The Dewey Decimal System has over 1 ... – PowerPoint PPT presentation

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Title: Cheops: A Compact Explorer for Complex Hierarchies


1
Cheops A Compact Explorer for Complex Hierarchies
2
What I Want to Know is
  • WTF is C.H.E.O.P.S.?
  • Crims Hierarchical Engine for OPen Search
  • I think theyre stretching a bit
  • Whats its purpose?
  • Allow for the display of very large
    hierarchies in a small amount of space
  • Aims for SVGA resolution

3
Audience Question
  • How would you graphically represent the Dewey
    Decimal System?
  • The Dewey Decimal System has over 1 billion (1e9)
    elements
  • The authors note that most hierarchical systems
    are designed for a maximum of 1000 to 5000
    elements before modifications are applied.
  • Answer

4
Whats Missing?
  • Slider
  • Users expected the sliders cursor position to
    be aligned to the selected node.
  • Bookmarks a manner to save deployed branches
  • Histograms show the user a summary of data
    associated with the logical nodes
  • e.g. associated documents, file sizes

5
Conceptual Model
  • Take a normal tree
  • Collapse as much as possible
  • Note the overloaded Triangle 5 is overloaded
    between nodes E and F

6
How Does Overloading Help?
  • Keeps the diagram more compact
  • Were only interested in browsing and
    exploration tasks, so this is sufficient
  • Resolutions
  • Click on overloaded node to see different
    resolutions
  • Explicitly specify a parent node.
  • Visual Cues

7
Usability Tests
  • No numbers/graphs provided. To quote
  • The very richness of visual cues indicating the
    selection state threw many users off-balance.
    The Cheops pyramid, the slider and the choices
    were effectively three views and three controls
    on one single internal state and users found it
    somewhat difficult to integrate them into a
    whole.
  • It was generally liked.

8
Conclusion
  • Pros
  • Context is always preserved
  • You can show lots of data
  • Cons
  • Navigation buttons poorly thought out
  • You cant pre-select once you click a button,
    the node is selected

9
Critique
  • Whats it good for?
  • Browsing and exploration tasks in complex
    hierarchical information structures.
  • What isnt it good for?
  • It is not intended for use in analyzing those
    structures.
  • This is difficult you cant see multiple
    structures at once.
  • Comparisons? Improvements?

10
HCI Metrics
  • User Performance 4/5
  • Learnability 4/5
  • Reading the conceptual model improved
    understanding
  • Model is simple
  • Error Rates 1/5
  • Applicable? Were only browsing data
  • Retention 3/5
  • Model is simple, but my memory is bad.
  • Users Subjective Satisfaction 3/5
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