The annual workshop on Behaviour Monitoring and Interpretation (BMI) was launched in 2007. The workshop is co-located with the German conference on Artificial Intelligence, and hence, receives much attention in the research community investigating intelligent means for behaviour monitoring and interpretation. The edition of the workshop in 2009 focused on the topic of well-being to reflect the significant interest in this research direction. The current volume consists of extended versions of selected contributions from this workshop as well as other invited articles covering major research themes in this field.

This volume aims to offer state-of-the-art contributions in the application area of well-being. The notion of well-being has been treated in diverse disciplines such as engineering, sociology, psychology and philosophy. With this book a perspective is offered to the latest trends in this field from a few different viewpoints. Well-being is indeed an omnipresent concept that reaches out to a myriad of aspects of our daily lives. In addition to supporting a healthy lifestyle, the concept of well-being extends to the selections involving the type of the environment we live in, the interactions we have with other humans, and the practices we engage in to achieve our plans for future. Well-being concerns us in our daily life, and hence, plays a fundamental role at all times and places. This fact in turn needs to be taken into account when designing ubiquitous computing technologies that pervade our life. With the presented articles the book provides a survey of different research projects that aim to address the many influential aspects of well-being that are considered in today's designs or play an essential role in the designs of the future.

The present volume is the second BMI edition that is published by IOS Press. We are looking forward to receiving feedback from our readership in order to better plan and prepare for future BMI workshop editions. We are thankful to all authors that have contributed to this volume and to the programme committee of the BMI workshop, who provided the authors with valuable reviews.

March 2011

Björn Gottfried and Hamid Aghajan