112 Personal Content Experience: Managing Digital Life in the Mobile Age Typically continuous use consists of small operations that require a little time, whereas the user can focus on using desktop computer for longer periods. For instance, when the user is jogging and listening to music, probably they adjust the volume without needing to use their eyes, since attention has to be continuously paid to the environment. In mobile use, the information related to the environment and its changes is often more signifi cant than in desktop computing. Informa- tion related to the situation is called context and it may be defi ned as (Dey 2001): “Context is any information that can be used to characterize the situation of an entity. An entity is a person, place, or object that is considered relevant to the interaction between a user and an application, including the user and applications themselves.” Most applications have little understanding of what the users are doing. Occasionally the mobile device may disturb the user’s current task. For instance, the device may notify the user about a received text message while engaged in a conversation. In some other situations, using the device is not possible as the user is occupied with another task, such as driving. Thus, it would be benefi cial for the user if the mobile devices had some awareness of their current context. Such systems are called context-aware (Dey 2001): “A system is context aware, if it uses context to provide relevant information and / or services to the user, where relevancy depends on the user’s task.” Context could be used to improve ease-of-use by decreasing the need for user input; reducing the amount of information that the user has to process; increasing the quality of presented information; adding context to information in order to support later information retrieval; and reducing the complexity of rules constituting the user’s mental model of the system (Cheverst et al. 2001; Dey 2001). There are many technologies for gathering context information, for instance, sensors embedded in the device, network services, and deriv- ing the information from other information. The gathered information is usually processed on the background and if not used immediately, can be stored for later use. 4.7.1 File Context Earlier we discussed how metadata may provide additional information about the content and enable various things that are benefi cial to the