Common models, patterns and best practices for pervasive systems design, implementation and evaluation

Practical experience building Gaia (Active Spaces), TEEVE (Tele-immersive Environment for Everybody), and Matrix (A Samsung sponsored project examining Active Spaces on PDAs) suggest certain common models, patterns and best practices aid the construction of pervasive and ubiquitous systems. While sharing many concerns with other software systems, these kinds of systems have particular problems. For example, these systems must be robust and provide highly available and reliable service without intervention of the user or manufacturer. These concerns form the focus of this position paper.