2019 Copyright © 2009, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. Chapter 5.23 User-Centered Mobile Computing Dean Mohamedally City University London, UK Panayiotis Zaphiris City University London, UK Helen Petrie City University London, UK INTRODUCTION Mobile computing and wireless communications continue to change the way in which we perceive our lifestyles and habits. Through an extensive literature review of state-of-the-art human-com- puter interaction issues in mobile computing (Mobile HCI), we examine recent pertinent case studies that attempt to provide practical mobile capabilities to users. We thus contribute to the reader a primer to the philosophy of developing mobile systems for user centred design. User centred design elicits the needs and requirements of end users. Its purpose in mobile systems is to enable useful computing and com- municating experiences for diverse types of users, anywhere at anytime and on demand. We shall therefore illustrate to the reader some of the key constraints of mobile devices such as limited visuals, contextual awareness and mobility itself, and more importantly how they can be overcome through innovative design and development. INFORMATION VISUALISATION One of the most fundamental objectives in the miniaturisation of computer technologies is to present a platform from which users can maintain usable levels of interaction with their data from wherever they are. Information visualisation has come a long way since the days of two-co- lour text-only format screens. Yet constraints determined by factors of physical engineering