The system – context is influenced by technical capabilities (hardware and software) used the system – screen size, accuracy location system, the transfer rate data connection, battery charge level, system available input devices. For example, if the transfer rate is low, the system can make an automatic transfer in a way that optimizes data transfer for energy saving, not a visual experience of the user, or switch the modem in a way low consumption (from 3G to 2G).
User goal – why a person uses the application at a time can be an important factor in the current context. However, this is difficult to determine, and especially in terms of mobility, the user may not want to have to manually specify the context. However, given that a user uses the same application in multiple contexts like, can describe its context manual application.
An additional solution is to record a user’s previous goals, and trying to obtain a model of them. However, all assumptions about a user’s current order must be confirmed with it.
Time – in terms of time are at least two categories to the context of time: time of day and Momen. For example, time of day can affect applications to change colors display at night (as do many GPS units for phone number tracker), or to a request for cafes in the vicinity of a user can be returned only those who have the program on application . Also, when the year can determine what information is displayed to the user.
There are roads or winter hiking trails are closed for safety reasons. Environment – a user’s physical environment can vary greatly while using an application. Physical context may include the lighting, background noise, temperature and weather conditions. For example, depending on the lighting, the screen can be automatically configured so as to make the most favorable compromise between energy and vision. Also, depending on weather conditions can give the user the routes which avoid roads blocked due to weather or i can recommend it to equip themselves appropriately for the weather forecast.
Use history – use history can provide important clues as to which information is interesting to the user. For example, if the last two uses were asked about bike trails, and the user has not yet come back to the starting point, one can deduce that all information needs related to bicycle routes. In the same context, it can be inferred when the user pauses in the middle of a long road, and I can provide local information about the surrounding area. Orientation – which today is located compass / gyroscope / accelerometer available in many mobile devices – is helpful in matching the information displayed on the device in the field. Many location-based services and augmented reality using integrated context orientation along with other information to add layers of information over the actual elements of the image produced by the camera of your mobile device.
Social and cultural context – includes information on navigation symbols, colors normally used (for example, in Romania, blue, red and green to describe different types of roads). Also on cultural longer depend on language, character set encodings and used, data format and amounts of money, the reference currency used, measurement, grammar, and other such information.
It also includes information about the social context of user interaction with others. In the context of the popularity of social networks (hundreds of millions of users), online socialization and relationships with various others may define how the 1:18 service. For example, Google Latitude allows users to publish their current location with different levels of accuracy for different groups of contacts (such as family and close friends can watch user with maximum precision allowed by the settings of the device, while people in other categories can see just what city is the user).