** "The brief history of ubicomp demonstrates three emergent features that appear across many applications. First, we must be able to use implicitly sensed context from the physical and electronic environment to determine a given service’s correct behavior. Context-aware computing demonstrates promise for making our interactions with services more seamless and less distracting from our everyday activities. Applications can work well when properly informed about the context of their use. Second, we must provision automated services to easily capture and store memories of live experiences and serve them up for later use. Finally, we need continuously available services. As we move toward the infusion ofubicomp into our everyday lives, the services provided will need to become constantly available partners with the human users, always interrupted and easily resumed."** "The focus on activities as opposed to tasks is a crucial departure from traditional HCI design."*** "They rarely have a clear beginning or end, so the design cannot assume a common starting point or closure and thus requires greater flexibility and simplicity."*** "Interruption is expected as users switch attention between competing concerns."*** "Multiple activities operate concurrently and might need to be loosely coordinated."*** "Time is an important discriminator in characterizing the ongoing relationship between people and computers."*** "Associative models of information are needed, because information is reused from multiple perspectives."