Quantifying Degree of Goal Directedness in Document Navigation: Application to the Evaluation of the Perspective-Drag Technique

Yves Guiard (1) , Yangzhou Du (2, 3) , Olivier Chapuis (2, 3)

1 ISM - Institut des Sciences du Mouvement Etienne Jules Marey
2 IN-SITU - Situated interaction
3 LRI - Laboratoire de Recherche en Informatique

This article pursues a two-fold goal. First we introduce degree of goal directedness (DGD), a novel quantitative dimension for the taxonomy of navigation tasks in general. As an attempt to operationalize the DGD concept in the context of electronic documents navigation, we introduce the serial target-acquisition (STA) experimental paradigm. We suggest that DGD and the STA paradigm may usefully enrich the conceptual toolkit of HCI research for the evaluation of navigation techniques. Our second goal is to illustrate the utility of the DGD concept by showing with a concrete example, Perspective Drag, the refinement it allows in evaluating navigation techniques. We report data obtained from two experiments with the STA paradigm that cast light on what Perspective Drag is specifically good for: it is particularly suitable in realistic task contexts where navigation is less than 100% directed by its terminal goal, that is, where the user wants not only to reach a particular item but also to pick up information from the document during document traversal.

Mots clés: Fitts' law; document navigation; goal-directed behavior; interactive multi-scale visualization; perspective viewing; task taxonomies

Domaines: Interface homme-machine [cs.HC]

Yves Guiard, Yangzhou Du, Olivier Chapuis. Quantifying Degree of Goal Directedness in Document Navigation: Application to the Evaluation of the Perspective-Drag Technique. CHI '07: Proceedings of the SIGCHI Conference on Human Factors and Computing Systems, Apr 2007, San Jose, United States. pp.327-336, ⟨10.1145/1240624.1240679⟩. ⟨hal-00539833⟩