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Designing usable systems is difficult and designers need effective tools that are usable themselves. Effective design tools should be based on proven knowledge of design. Capturing knowledge about the successful design of usable systems is important for both novice and experienced designers and traditionally, this knowledge has largely been described in(More)
In this paper we propose a scripting language, called STEP, for embodied agents, in particular for their communicative acts like gestures and postures. Based on the formal semantics of dynamic logics, STEP has a solid semantic foundation, in spite of a rich number of variants of the compositional operators and interaction facilities on the worlds. STEP has(More)
Human-like characters in the interface may evoke social responses in users, and literature suggests that realism is the most important factor herein. However, the effects of interface characters on the user are not well understood. We developed an integrative framework, called I-PEFiC, to explain 'persona' and realism effects on the user. We tested an(More)
Preface This thesis could not have been written without the help and inspiration of many people around me. At the Vrije Universiteit, I was in an interesting environment with many different ideas. I want to thank Gerrit van der Veer, Anton Eliëns and Hans van Vliet for their enthusiasm and how they enriched my research by showing me their perspectives.(More)
Business visualization is becoming increasingly important, since managers recognize the power of human visual intuition in information-rich decision tasks. Nevertheless, despite its promises, 3D visualizations are far less common than one would expect. In this paper, we describe a case study where we took a 2D visualization of a business process as a(More)
A growing interest is seen for designing intelligent environments that support personally meaningful, sociable and rich everyday experiences. In this paper we describe an intelligent, large screen display called Panorama that is aimed at supporting and enhancing social awareness within an academic work environment. Panorama is not intended to provide(More)