This book constitutes the proceedings of the 7th International and Interdisciplinary Conference on Modeling and Using Context, CONTEXT 2011, held in Karlsruhe, Germany in September 2011. The 17 full papers and 7 short papers presented were carefully reviewed and selected from 54 submissions. In addition the book contains two keynote speeches and 8 poster papers. They cover cutting-edge results from the wide range of disciplines concerned with context, including the cognitive sciences (linguistics, psychology, philosophy, computer science, neuroscience), the social sciences and organization sciences, and all application areas.

This book constitutes the refereed proceedings of the 7th International Conference on Pervasive Computing, Pervasive 2009, held in Nara, Japan, in May 2009.

The 20 revised full papers and 7 revised short papers presented were carefully reviewed and selected from 147 initial submissions. The papers are organized in topical sections on digital displays, navigation, at home with pervasive applications, sensors, sensors, everywhere, working together, tagging and tracking, methods and tools, and the importance of context.

The 7th International Conference on Ubiquitous Computing (UbiComp 2005) marked the ?rst time that this premier venue for original research contributions in ubiquitous computing was held in Asia. The Tokyo, Japan venue re?ects the desireoftheUbiCompcommunitytomakethisconferenceseriesaninternational event that showcases the increasing amount of high-quality ubiquitous comp- ing researchthat is taking placeworldwide.As the ?eld ofubiquitous computing has matured, the UbiComp Conference has gained signi?cance worldwide, not only among researchers, but also with industry and general society. This interest in the potential of ubiquitous computing to impact our lives has resulted in the creation of many new research programs in academia and industry. These e?orts have, in turn, led to mass media coverage of e?orts and, in some regions of the world, large-scale government-initiated collaborative - forts to explore the potential of these emerging technologies. These trends are re?ected in the rise in the number of submissions to UbiComp 2005. This year the conference received 230 full papers, submitted almost equally from Asia (?100 submissions), North America and South America (?6 0 submissions) and Europe(?60submissions),withtheremainderbeingreceivedfromAustraliaand Africa. Fromamong many high-qualitysubmissions, the technical programc- mittee accepted 22 papers. These paperswere chosenbased solely on the quality of their peer reviews using a double-blind review process.

The keychallengeforfuture computersystemis dealingwithcomplexity.Onone hand this involves internal system complexity which has increased exponentially over recent years. Here the main objectives are to maintain system reliability and to keep the design and maintenance e?ort manageable, while at the same timecontinuingtoprovidenewfunctionalityandincreasingsystemperformance. This hasbeenthe focus ofso-calledautonomouscomputing, whichaimsto bring self-con?guration and repair to a wide range of computing systems. On the other hand future computer systems are more and more becoming integrated into the fabric of everyday life and thus have to deal with the c- plexities of the real world. They will become smaller, more appropriate for their use, integrated into everyday objects, and often virtually or physically invisible to the users.They will alsobe deployedin a muchhigher quantity andpenetrate many moreapplicationareasthan traditional notionsof computer systems.This requirescomputersystemstobeadaptablewithinamuchwiderrangeofpossible tasks, subjected to much harsher conditions. To provide such features and functionality, computer devices will become tinieryetstillincreaseinsystemcomplexity;theymustconsumelesspower, while still supporting advanced computation and communications, such that they are highlyconnectedyetstilloperateasautonomousunits.Pervasiveandubiquitous computing researchaddressessuchissues by developingconcepts and technology for interweaving computers into our everyday life. The principal approach is to enhance system functionality and adaptability by recognizing context and situations in the environment