- When application is started, context logger starts logging all included sensors - When application is running user has possibility to communicate that he has now started specific activity (start button?) - There should be a list of following predefined activities available (dropdown menu?): 1. At home 2. At work 3. Walking 4. Cycling 5. Driving a car 6. In a bus 7. In a train 8. In a subway 9. Taking a taxi - There should also be possibility to define your own context (free text field?) instead of predefined contexts - It should also be possible to communicate that I have now stopped the activity (stop button?)