Informed decisions are based on the availability of information and the ability of decision-makers to manipulate this information. More often than not, the decision-relevant information is subject to uncertainty arising from different sources. Consequently, decisions involve an undeniable amount of risk. An effective visualisation tool to support informed decision-making must enable users to no...

Graphs and maps are powerful abstractions. Their combination, Hierarchical Graph Maps, provide effective tools to process a graph that is too large to fit on the screen. They provide hierarchical visual indices (i.e. maps) that guide navigation and visualization. Hierarchical graph maps deal in a unified manner with both the screen and I/O bottlenecks. This line of thinking adheres to the Visua...

This paper is centred on the study of the role that information visualisation can have in mathematics learning. A theoretical analysis is worked out in order to give account of the complex phenomena that take place in the classroom in order to allow students to construct a mental image of the mathematical object involved in the activity. This theoretical analysis is the reference to study the d...

A meta-analysis is conducted on a set of empirical studies of information visualization. To be included in the meta-analysis, a study must meet a set of selection criteria. The meta-analysis synthesizes signi"cant levels and e!ect sizes, tests the heterogeneity of "ndings from individual studies included and tests the linear trends over a range of information visualization features with ascendi...

Information visualization is an experience in which both the aesthetic representations and interaction are part. Such an experience can be augmented through close consideration of its major components. Interaction is crucial to the experience, yet it has seldom been adequately explored in the field. We claim that direct mediated interaction can augment such an experience. This paper discusses t...

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Heart-like visualization as a substitute and supplement to canonical visualization contains more information than a canonical one, while at the same time being acceptable and recognizable to the observer. Heart-like visualization makes a quick and simple qualitative assessment of the condition of the evolution algorithm possible, and it is appropriate for a dynamic observance of algorithm flow.

Microblogging has been recently used for detecting common opinions of users at different geographic places. In this paper we propose a novel spatial visualization system for uncovering collective spatial attention and interest of users not at but rather towards different locations. In other words, we aim to answer questions of the type: what do users collectively talk about when they refer to c...

Email is one of the most widely-used means of communication, as evidenced by the soaring rates rates of mailing volumes since the introduction of email as an Internet service. While considerable work has been done in improving the efficiency of email management, there is a need for improving its functionality (effectiveness). Typically, users are given few means to intelligently explore the wea...