Adaptive Hypermedia 2008
Program  > 1 August (Fri)  > Empirical Studies 
Empirical Studies

Friday 1 August, 14:00 - 15:30

Chair: Nicola Henze

 Proactive Versus Multimodal Online Help: An Empirical Study (page 183)

Jerome Simonin and Noelle Carbonell

Two groups of 8 participants experimented two enhancements of standard online help for the general public during one hour: adaptive proactive (AP) assistance and multimodal user support. Proactive help, that is, anticipation of the user's information needs raised very positive judgments, while dynamic adaptation to the user's current knowledge and skills went almost unnoticed. Speech and graphics (SG) messages were also well accepted, based on the observation that one can go on interacting with the software application while listening to instructions. However, several participants observed that the transience and linearity of speech limited the usability of this modality. Analysis of interaction logs and post-tests shows that procedural and semantic knowledge acquisition was higher with SG help than with AP assistance. Contrastingly, AP help was consulted more often than SG user support. Results also suggest that proactive online help may reduce the effectiveness of autonomous "learning by doing" acquisition of unfamiliar software concepts and procedures.

The Effectiveness of Personalized Movie Explanations: An Experiment Using Commercial Meta-data (page 204)

Nava Tintarev and Judith Masthoff

This paper studies the properties of a helpful and trustworthy explanation in a movie recommender system. It discuss the results of an experiment based on a natural language explanation prototype. The explanations were varied according to three factors: degree of personalization, polarity and expression of unknown movie features. Personalized explanations were not found to be significantly more Effective than non-personalized, or baseline explanations. Rather, explanations in all three conditions performed surprisingly well. We also found that participants evaluated the explanations themselves most highly in the personalized, feature-based condition.

Adaptive Link Annotation in Distributed Hypermedia Systems: The Evaluation of a Service-Based Approach (page 245)

Michael Yudelson and Peter Brusilovsky

A service-based approach to link annotation expands the applicability of adaptive navigation support functionality beyond the limits of traditional adaptive hypermedia systems. With this approach, the decision-making functionality is separated from the application systems and encapsulated in a personalization service. This paper attempts to evaluate the feasibility of using this approach in the real world. After a brief overview of current efforts to develop service-based approaches to adaptive hypermedia, we describe our specific implementation of this approach as personalization architecture and report the results of an extensive performance evaluation of this architecture.
User Modeling Inc. Leibniz University Hanover L3S Research Center Adaptive Hypermedia 2008 Conference Website
Eelco Herder (L3S Research Center, Hannover, Germany)