Interactive Visual Facets to Support Fluid Exploratory Search

TL;DR

This paper introduces interactive visual facets (IVF) to enhance fluid exploratory search by visualizing information facets, enabling rapid transitions, and supporting user comprehension and control in dynamic search scenarios.

Contribution

The paper proposes a novel IVF tool with a filter-swipe technique, addressing design requirements for fluid, exploratory search interactions not fully supported by existing interfaces.

Findings

User study shows IVF improves search fluidity and user satisfaction.

Filter-swipe technique enables efficient item intersection exploration.

Participants preferred IVF's dynamic suggestions over traditional filtering.

Abstract

Exploratory search starts with ill-defined goals and involves browsing, learning, and formulating new targets for search. To fluidly support such dynamic search behaviours, we focus on devising interactive visual facets (IVF), visualising information facets to support user comprehension and control of the information space. To do this, we reviewed existing faceted search interfaces and derived two design requirements (DR) that have not been fully addressed to support fluid interactions in exploratory search. We then exemplified the requirements through devising an IVF tool, which coordinates a linear and a categorical facet representing the distribution and summarisation of items, respectively, and providing context for faceted exploration (DR1). To support rapid transitions between search criteria (DR2), the tool introduces a novel design concept of using facets to select items without filtering the item space. Particularly, we propose a filter-swipe technique that enables users to drag a categorical facet value sequentially over linear facet bars to view the items in the intersection of the two facets along with the categorical facet dynamically summarizing the items in the interaction. Three applications demonstrate how the features support information discovery with ease. A user study of 11 participants with realistic email search tasks shows that dynamic suggestions through the timeline navigation can help discover useful suggestions for search; the novel design concept was favoured over using facet values as filters. Based on these practices, we derive IVF design implications for fluid, exploratory searches.