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    Active reading techniques, originally for text, can be applied to visualizations. Supporting these techniques in interactive tools improves task accuracy and enhances visualization reading.

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    Area of Science:

    • Information Visualization
    • Human-Computer Interaction

    Background:

    • Active reading, a strategy for text comprehension, involves physical engagement.
    • Its applicability to visual data representations like node-link diagrams is unexplored.

    Purpose of the Study:

    • To investigate if active reading techniques can be applied to node-link visualizations.
    • To explore the impact of supporting these techniques on visualization reading effectiveness.

    Main Methods:

    • Qualitative study observing participants reading paper-based node-link visualizations.
    • Synthesis of active reading techniques from observed physical actions.
    • Quantitative study evaluating an interactive visualization supporting freeform marking.

    Main Results:

    • Identified an initial set of observable active reading techniques for visualizations.
    • Interactive support for making freeform marks improved accuracy in low-level visualization tasks.

    Conclusions:

    • Active reading is a promising research area for information visualization.
    • Interactive support for active reading techniques can enhance visualization interaction and user performance.