[unrev-II] CASCADE's Multi-level Navigation of a Document Space and Augmentation Design Philoshophy

From: John J. Deneen (JJDeneen@ricochet.net)
Date: Mon Jul 24 2000 - 13:06:29 PDT

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    "The idea of visualizing things is easy. Essentially, anything that
    naturally exists in a three-dimensional space is pretty easy to
    visualize. Ideas are more difficult to visualize algorithmically. Much
    of the effort to date in CASCADE has played with visualization of
    documents and document spaces."...

    "From the set of identifiable document processes[51,10], tasks exist
    where only a small portion of the subtasks require cognitive processing.
    In CASCADE, the task is so structured as to offload the mechanical tasks
    to the computer. For example, making a hypertext comment requires 10-15
    actions (depending on how the process is defined). Only one of these
    tasks, writing the comment itself, actually requires the commenter--the
    rest can be done by the system. ``Augmentation'', as used by
    Engelbart[25,24,26,23,22,21], involves task analysis and redesign to
    create a set of processes that optimize the human side of the human
    computer interaction. CASCADE augments comment and comment review
    processes already. Research will augment additional document related

    "Docuverse represents a large document space. Each object in the space
    is rendered as a small dot and the color of the dot depicts the state of
    one of the object's attributes. Shneiderman's [16,8] Treemaps provide
    similar results by rendering files and directories as bars. In the
    Docuverse, files (or documents) are shown as colored arc segments and
    directories (or containers) as enclosed pie segments. At the current
    time, the Docuverse allows the user to recursively display up to six
    levels of the document tree structure showing the size, type, age,
    number of links, or usage of each object. Figure 1 shows a 4-level
    directory hierarchy containing 3502 files in 164 directories showing the
    age of each files. Theoretically, using an arc size of one pixel, one
    could display 1,000,000 documents on a 1000x1000 pixel display. In
    reality, we think it would be possible to display up to about 10,000
    documents in a Docuverse space, and practical to display 3,000 or so
    documents comfortably."....

    "Docuverse provides a view of a large (1,000-5,000) set of objects with
    minimal information about each object. Webview provides a tree-based
    structural display of a smaller part of the file system or document
    space. It shows individual document components, selected attributes of
    the components and the links between them. At the current time, Webview
    shows only hierarchical file system links. Once the DBMS control
    structure has been completed, any number of relational structures may be
    mapped to the same basic tree. As indicated, unlike Docuverse, the
    Webview displays multiple attributes of the components. The nodes
    display the object's name, its type is mapped to color, and for
    system-generated files, the name also depicts author and creation

    Shared Defect Detection : The Effects of Annotations in Asynchronous
    Software Inspection
    Off-loading routine tasks to computer and allowing human to focus on
    high-level cognitive tasks.

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