Location and Orientation
During everyday usage, people rarely focus their attention exclusively on wearables because their primary interests and tasks are part of the real world. As a result, wearables should minimize the amount of user intervention they require. In a way, user intervention is a limited resource, just like battery consumption or network bandwidth. The need for user intervention is reduced by knowing where users are located and in which direction their devices are facing. For instance, an application could remind users to carry their umbrellas as they leave their homes on a day with a rainy forecast. Location and orientation are the foundation for contextual awareness, and exploiting these capabilities is likely to lead to innovative wearable apps.